@tensorflow/tfjs-data - npm Package Compare versions

Comparing version 4.5.0 to 4.6.0

dist/miniprogram/index.js

@@ -17,3 +17,3 @@ /**
  */
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If your data fits in main memory (for regular JS objects), and/or GPU memory (for `tf.Tensor`s), consider setting "+"bufferSize to the dataset size (".concat(this.size," elements)"));var o=this,a=D.alea(e||r.util.now().toString());return ht((function(){return u(i,void 0,void 0,(function(){var e;return s(this,(function(r){switch(r.label){case 0:return e=a.int32(),n&&(e+=a.int32()),[4,o.iterator()];case 1:return[2,r.sent().shuffle(t,e.toString())]}}))}))}),this.size)},t.prototype.take=function(t){var e=this,n=this;return ht((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().take(t)]}}))}))}),null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null)},t.prototype.toArray=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:if(this.size===1/0)throw new Error("Can not convert infinite data stream to 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r.Tensor?r.stack(t):r.tensor(t)}(t),recurse:!1}:{value:null,recurse:!0}}ft.MAX_BUFFER_SIZE=1e4;var dt=function(t){function e(e){var n=t.call(this)||this;return n.input=e,n}return o(e,t),e.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:return[4,this.input.iterator()];case 1:return t=n.sent(),e=t.decodeUTF8(),[2,e.split("\n").map((function(t){return t.endsWith("\r")&&(t=t.slice(0,-1)),t}))]}}))}))},e}(ft),vt='"',mt=Symbol("out"),yt=Symbol("field"),wt=Symbol("quote"),bt=Symbol("quoteafterquote"),gt=Symbol("quoteinquote"),xt=function(t){function n(n,r){var i=t.call(this)||this;return i.input=n,i.hasHeader=!0,i.fullColumnNames=null,i.columnNamesValidated=!1,i.columnConfigs=null,i.configuredColumnsOnly=!1,i.delimiter=",",i.delimWhitespace=!1,i.base=new dt(n),r||(r={}),i.hasHeader=!1!==r.hasHeader,i.fullColumnNames=r.columnNames,i.columnConfigs=r.columnConfigs,i.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.util.assert(null==r.delimiter,(function(){return"Delimiter should not be provided when delimWhitespace is true."})),i.delimWhitespace=!0,i.delimiter=" "):i.delimiter=r.delimiter?r.delimiter:",",i}return o(n,t),n.prototype.columnNames=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return this.columnNamesValidated?[3,2]:[4,this.setColumnNames()];case 1:t.sent(),t.label=2;case 2:return[2,this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames]}}))}))},n.prototype.setColumnNames=function(){return u(this,void 0,void 0,(function(){var t,n,r,i,o,u,c,l,f=this;return s(this,(function(s){switch(s.label){case 0:return[4,this.maybeReadHeaderLine()];case 1:if(t=s.sent(),!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");if(this.fullColumnNames&&t&&e.util.assert(t.length===this.fullColumnNames.length,(function(){return"The length of provided columnNames ("+f.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+")."})),this.fullColumnNames||(this.fullColumnNames=t),n=this.fullColumnNames.reduce((function(t,e){return t[e]=t[e]+1||1,t}),{}),r=Object.keys(n).filter((function(t){return n[t]>1})),e.util.assert(0===r.length,(function(){return"Duplicate column names found: "+r.toString()})),this.columnConfigs)try{for(i=a(Object.keys(this.columnConfigs)),o=i.next();!o.done;o=i.next())if(u=o.value,-1===this.fullColumnNames.indexOf(u))throw new Error('The key "'+u+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}catch(t){c={error:t}}finally{try{o&&!o.done&&(l=i.return)&&l.call(i)}finally{if(c)throw c.error}}return this.columnNamesValidated=!0,[2]}}))}))},n.prototype.maybeReadHeaderLine=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:return this.hasHeader?[4,this.base.iterator()]:[3,3];case 1:return[4,n.sent().next()];case 2:if((t=n.sent()).done)throw new Error("No data was found for CSV parsing.");return e=t.value,[2,this.parseRow(e,!1)];case 3:return[2,null]}}))}))},n.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t,e=this;return s(this,(function(n){switch(n.label){case 0:return this.columnNamesValidated?[3,2]:[4,this.setColumnNames()];case 1:n.sent(),n.label=2;case 2:return[4,this.base.iterator()];case 3:return t=n.sent(),this.hasHeader&&(t=t.skip(1)),[2,t.map((function(t){return e.makeDataElement(t)}))]}}))}))},n.prototype.makeDataElement=function(t){for(var e=this.parseRow(t),n={},r={},i=0;i<this.fullColumnNames.length;i++){var o=this.fullColumnNames[i],u=this.columnConfigs?this.columnConfigs[o]:null;if(!this.configuredColumnsOnly||u){var s=e[i],a=null;if(""===s)if(u&&void 0!==u.default)a=u.default;else{if(u&&(u.required||u.isLabel))throw new Error("Required column ".concat(o," is empty in this line: ").concat(t));a=void 0}else{var c=Number(s);if(isNaN(c))a=u&&"bool"===u.dtype?this.getBoolean(s):s;else if(u&&u.dtype)switch(u.dtype){case"float32":default:a=c;break;case"int32":a=Math.floor(c);break;case"bool":a=this.getBoolean(s)}else a=c}u&&u.isLabel?r[o]=a:n[o]=a}}return 0===Object.keys(r).length?n:{xs:n,ys:r}},n.prototype.getBoolean=function(t){return"1"===t||"true"===t.toLowerCase()?1:0},n.prototype.parseRow=function(t,e){void 0===e&&(e=!0);for(var n=[],r=0,i=t.length,o=mt,u=0;u<i;u++)switch(o){case mt:switch(t.charAt(u)){case vt:r=u+1,o=wt;break;case this.delimiter:if(r=u+1," "===this.delimiter&&this.delimWhitespace)break;n.push(""),o=mt;break;default:o=yt,r=u}break;case yt:if(t.charAt(u)===this.delimiter)n.push(t.substring(r,u)),o=mt,r=u+1;break;case wt:if(t.charAt(u)===vt)o=bt;break;case bt:switch(t.charAt(u)){case this.delimiter:n.push(t.substring(r,u-1)),o=mt,r=u+1;break;case vt:o=wt;break;default:o=gt}break;case gt:if(t.charAt(u)===vt)o=wt}if(o===bt?n.push(t.substring(r,i-1)):n.push(t.substring(r)),e&&n.length!==this.fullColumnNames.length)throw new Error("Invalid row in csv file. Should have ".concat(this.fullColumnNames.length," elements in a row, but got ").concat(n));return n},n}(ft),Ct=function(t){function n(e){var n=t.call(this)||this;n.microphoneConfig=e,n.isClosed=!1,n.fftSize=e.fftSize||1024;var r=Math.log2(n.fftSize);if(n.fftSize<0||r<4||r>14||!Number.isInteger(r))throw new Error("Invalid fftSize: it must be a power of 2 between "+"2 to 4 and 2 to 14, but got ".concat(n.fftSize));if(n.numFrames=e.numFramesPerSpectrogram||43,n.sampleRateHz=e.sampleRateHz,n.columnTruncateLength=e.columnTruncateLength||n.fftSize,n.audioTrackConstraints=e.audioTrackConstraints,n.smoothingTimeConstant=e.smoothingTimeConstant||0,n.includeSpectrogram=!1!==e.includeSpectrogram,n.includeWaveform=!0===e.includeWaveform,!n.includeSpectrogram&&!n.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.");return n}return o(n,t),n.prototype.summary=function(){return"microphone"},n.create=function(t){return void 0===t&&(t={}),u(this,void 0,void 0,(function(){var r;return s(this,(function(i){switch(i.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");return[4,(r=new n(t)).start()];case 1:return i.sent(),[2,r]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,e,n,r;return s(this,(function(i){switch(i.label){case 0:return i.trys.push([0,2,,3]),t=this,[4,navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})];case 1:return t.stream=i.sent(),[3,3];case 2:throw e=i.sent(),new Error("Error thrown while initializing video stream: ".concat(e.message));case 3:if(!this.stream)throw new Error("Could not obtain audio from microphone.");if(n=window.AudioContext||window.webkitAudioContext,this.audioContext=new n,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error("Mismatch in sampling rate: "+"Expected: ".concat(this.sampleRateHz,"; ")+"Actual: ".concat(this.audioContext.sampleRate))}else this.sampleRateHz=this.audioContext.sampleRate;return r=this.audioContext.createMediaStreamSource(this.stream),this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,r.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize),[2]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i;return s(this,(function(o){switch(o.label){case 0:return this.isClosed?[2,{value:null,done:!0}]:[4,this.getAudioData()];case 1:return n=o.sent(),this.includeSpectrogram&&(r=this.flattenQueue(n.freqDataQueue),t=this.getTensorFromAudioDataArray(r,[this.numFrames,this.columnTruncateLength,1])),this.includeWaveform&&(i=this.flattenQueue(n.timeDataQueue),e=this.getTensorFromAudioDataArray(i,[this.numFrames*this.fftSize,1])),[2,{value:{spectrogram:t,waveform:e},done:!1}]}}))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.getAudioData=function(){return u(this,void 0,void 0,(function(){var t,e,n,r=this;return s(this,(function(i){return t=[],e=[],n=0,[2,new Promise((function(i){var o=setInterval((function(){r.includeSpectrogram&&(r.analyser.getFloatFrequencyData(r.freqData),r.freqData[0]===-1/0&&i({freqDataQueue:t,timeDataQueue:e}),t.push(r.freqData.slice(0,r.columnTruncateLength))),r.includeWaveform&&(r.analyser.getFloatTimeDomainData(r.timeData),e.push(r.timeData.slice())),++n===r.numFrames&&(clearInterval(o),i({freqDataQueue:t,timeDataQueue:e}))}),r.fftSize/r.sampleRateHz*1e3)}))]}))}))},n.prototype.stop=function(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())},n.prototype.toArray=function(){throw new Error("Can not convert infinite audio stream to array.")},n.prototype.getSampleRate=function(){return this.sampleRateHz},n.prototype.flattenQueue=function(t){var e=t[0].length,n=new Float32Array(t.length*e);return t.forEach((function(t,r){return n.set(t,r*e)})),n},n.prototype.getTensorFromAudioDataArray=function(t,n){var r=new Float32Array(e.util.sizeFromShape(n));return r.set(t,r.length-t.length),e.tensor(r,n)},n}(G),zt=function(t){function n(n,r){var i=t.call(this)||this;if(i.webcamVideoElement=n,i.webcamConfig=r,i.isClosed=!0,i.resize=!1,i.needToResize())if(i.resize=!0,i.cropSize=[i.webcamConfig.resizeHeight,i.webcamConfig.resizeWidth],i.cropBoxInd=e.tensor1d([0],"int32"),i.webcamConfig.centerCrop){var o=1*i.webcamConfig.resizeWidth/i.webcamVideoElement.width,u=1*i.webcamConfig.resizeHeight/i.webcamVideoElement.height,s=(1-o)/2,a=(1-u)/2,c=s+o,l=u+a;i.cropBox=e.tensor2d([a,s,l,c],[1,4])}else i.cropBox=e.tensor2d([0,0,1,1],[1,4]);return i}return o(n,t),n.prototype.summary=function(){return"webcam"},n.create=function(t,r){return void 0===r&&(r={}),u(this,void 0,void 0,(function(){var i;return s(this,(function(o){switch(o.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!r.resizeWidth||!r.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=r.resizeWidth,t.height=r.resizeHeight}return[4,(i=new n(t,r)).start()];case 1:return o.sent(),[2,i]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,n,r=this;return s(this,(function(i){switch(i.label){case 0:this.webcamConfig.facingMode&&e.util.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(function(){return"Invalid webcam facing mode: ".concat(r.webcamConfig.facingMode,". ")+"Please provide 'user' or 'environment'"})),i.label=1;case 1:return i.trys.push([1,3,,4]),t=this,[4,navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})];case 2:return t.stream=i.sent(),[3,4];case 3:throw(n=i.sent()).message="Error thrown while initializing video stream: ".concat(n.message),n;case 4:if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,[2,new Promise((function(t){r.webcamVideoElement.onloadedmetadata=function(){t()}}))]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t;return s(this,(function(n){if(this.isClosed)return[2,{value:null,done:!0}];try{t=e.browser.fromPixels(this.webcamVideoElement)}catch(t){throw new Error("Error thrown converting video to pixels: ".concat(JSON.stringify(t)))}if(!this.resize)return[2,{value:t,done:!1}];try{return[2,{value:this.cropAndResizeFrame(t),done:!1}]}catch(t){throw new Error("Error thrown cropping the video: ".concat(t.message))}finally{t.dispose()}return[2]}))}))},n.prototype.needToResize=function(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)},n.prototype.cropAndResizeFrame=function(t){var n=this;return e.tidy((function(){var r,i=e.expandDims(e.cast(t,"float32"),0),o=(r=e.image.cropAndResize(i,n.cropBox,n.cropBoxInd,n.cropSize,"bilinear")).shape;return e.reshape(r,o.slice(1))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.stop=function(){this.stream.getTracks().forEach((function(t){return t.stop()}));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0},n.prototype.toArray=function(){throw new Error("Can not convert infinite video stream to array.")},n}(G),Et=function(){},St=function(t){function e(){return null!==t&&t.apply(this,arguments)||this}return o(e,t),e.prototype.split=function(t){return new At(this,t)},e}(G),At=function(t){function e(e,n){var r=t.call(this)||this;return r.upstream=e,r.impl=new Rt(e,n),r}return o(e,t),e.prototype.summary=function(){return this.impl.summary()},e.prototype.next=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return[2,this.impl.next()]}))}))},e}(St),Rt=function(t){function e(e,n){var r=t.call(this)||this;return r.upstream=e,r.separator=n,r.carryover="",r}return o(e,t),e.prototype.summary=function(){return"".concat(this.upstream.summary()," -> Split('").concat(this.separator,"')")},e.prototype.pump=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i,o,u;return s(this,(function(s){switch(s.label){case 0:return[4,this.upstream.next()];case 1:if((t=s.sent()).done)return""===this.carryover?[2,!1]:(this.outputQueue.push(this.carryover),this.carryover="",[2,!0]);(e=t.value.split(this.separator))[0]=this.carryover+e[0];try{for(n=a(e.slice(0,-1)),r=n.next();!r.done;r=n.next())i=r.value,this.outputQueue.push(i)}catch(t){o={error:t}}finally{try{r&&!r.done&&(u=n.return)&&u.call(n)}finally{if(o)throw o.error}}return this.carryover=e[e.length-1],[2,!0]}}))}))},e}(ot),Tt=function(t){function e(){return null!==t&&t.apply(this,arguments)||this}return o(e,t),e.prototype.decodeUTF8=function(){return new kt(this)},e}(G),kt=function(t){function e(e){var n=t.call(this)||this;return n.upstream=e,n.impl=new Ft(e),n}return o(e,t),e.prototype.summary=function(){return this.impl.summary()},e.prototype.next=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return[2,this.impl.next()]}))}))},e}(St),Ft=function(t){function n(n){var r=t.call(this)||this;if(r.upstream=n,e.env().get("IS_BROWSER"))r.decoder=new TextDecoder("utf-8");else{var i=require("string_decoder").StringDecoder;r.decoder=new i("utf8")}return r}return o(n,t),n.prototype.summary=function(){return"".concat(this.upstream.summary()," -> Utf8")},n.prototype.pump=function(){return u(this,void 0,void 0,(function(){var t,n,r;return s(this,(function(i){switch(i.label){case 0:return[4,this.upstream.next()];case 1:return(t=i.sent()).done?[2,!1]:(n=t.value,r=e.env().get("IS_BROWSER")?this.decoder.decode(n,{stream:!0}):this.decoder.write(Buffer.from(n.buffer)),this.outputQueue.push(r),[2,!0])}}))}))},n}(ot),Nt=function(t){function n(n,r){void 0===r&&(r={});var i=t.call(this)||this;return i.file=n,i.options=r,e.util.assert(n instanceof Uint8Array||!!e.env().get("IS_BROWSER")&&(n instanceof File||n instanceof Blob),(function(){return"FileChunkIterator only supports File, Blob and Uint8Array right now."})),i.offset=r.offset||0,i.chunkSize=r.chunkSize||1048576,i}return o(n,t),n.prototype.summary=function(){return"FileChunks ".concat(this.file)},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t,e,n=this;return s(this,(function(r){switch(r.label){case 0:return this.offset>=(this.file instanceof Uint8Array?this.file.byteLength:this.file.size)?[2,{value:null,done:!0}]:(t=new Promise((function(t,e){var r=n.offset+n.chunkSize;if(n.file instanceof Uint8Array)t(new Uint8Array(n.file.slice(n.offset,r)));else{var i=new FileReader;i.onload=function(n){var r=i.result;if(r instanceof ArrayBuffer&&(r=new Uint8Array(r)),!(r instanceof Uint8Array))return e(new TypeError("FileReader returned unknown type."));t(r)},i.onabort=function(t){return e(new 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s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().prefetch(t)]}}))}))}),this.size)},t.prototype.repeat=function(t){var e=this,n=this;return ht((function(){return u(e,void 0,void 0,(function(){var e,r=this;return s(this,(function(i){return e=Q((function(){return u(r,void 0,void 0,(function(){var t;return s(this,(function(e){switch(e.label){case 0:return t={},[4,n.iterator()];case 1:return[2,(t.value=e.sent(),t.done=!1,t)]}}))}))})),[2,(o=e.take(t),new st(o,a))];var o,a}))}))}),null!=this.size&&t>0?this.size*t:0===t?0:null!=this.size&&(void 0===t||t<0)?1/0:null)},t.prototype.skip=function(t){var e=this,n=this;return ht((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().skip(t)]}}))}))}),null!=this.size&&t>=0&&this.size>=t?this.size-t:null!=this.size&&(this.size<t||void 0===t||t<0)?0:null)},t.prototype.shuffle=function(t,e,n){var i=this;if(void 0===n&&(n=!0),null==t||t<0)throw null==this.size?new RangeError("`Dataset.shuffle()` requires bufferSize to be specified."):new RangeError("`Dataset.shuffle()` requires bufferSize to be specified.  If your data fits in main memory (for regular JS objects), and/or GPU memory (for `tf.Tensor`s), consider setting "+"bufferSize to the dataset size (".concat(this.size," elements)"));var o=this,a=D.alea(e||r.util.now().toString());return ht((function(){return u(i,void 0,void 0,(function(){var e;return s(this,(function(r){switch(r.label){case 0:return e=a.int32(),n&&(e+=a.int32()),[4,o.iterator()];case 1:return[2,r.sent().shuffle(t,e.toString())]}}))}))}),this.size)},t.prototype.take=function(t){var e=this,n=this;return ht((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().take(t)]}}))}))}),null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null)},t.prototype.toArray=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return[4,this.iterator()];case 1:return[2,t.sent().toArray()]}}))}))},t.prototype.toArrayForTest=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return[4,this.iterator()];case 1:return[2,t.sent().toArrayForTest()]}}))}))},t}();function ht(t,e){return void 0===e&&(e=null),new(function(n){function r(){var t=n.apply(this,l([],c(arguments),!1))||this;return t.size=e,t}return o(r,n),r.prototype.iterator=function(){return u(this,void 0,void 0,(function(){return s(this,(function(e){return[2,t()]}))}))},r}(ft))}function pt(t){return null===t?null:function(t){return null==t||null===(e=t)||"object"!=typeof e&&"function"!=typeof e||Array.isArray(t)||"object"==typeof t&&t instanceof r.Tensor||r.util.isTypedArray(t);var e}(t[0])?{value:function(t){if(0===t.length)throw new Error("Can't make a batch of zero elements.");return t[0]instanceof r.Tensor?r.stack(t):r.tensor(t)}(t),recurse:!1}:{value:null,recurse:!0}}ft.MAX_BUFFER_SIZE=1e4;var dt=function(t){function e(e){var n=t.call(this)||this;return n.input=e,n}return o(e,t),e.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:return[4,this.input.iterator()];case 1:return t=n.sent(),e=t.decodeUTF8(),[2,e.split("\n").map((function(t){return t.endsWith("\r")&&(t=t.slice(0,-1)),t}))]}}))}))},e}(ft),vt='"',mt=Symbol("out"),yt=Symbol("field"),wt=Symbol("quote"),bt=Symbol("quoteafterquote"),gt=Symbol("quoteinquote"),xt=function(t){function n(n,r){var i=t.call(this)||this;return i.input=n,i.hasHeader=!0,i.fullColumnNames=null,i.columnNamesValidated=!1,i.columnConfigs=null,i.configuredColumnsOnly=!1,i.delimiter=",",i.delimWhitespace=!1,i.base=new dt(n),r||(r={}),i.hasHeader=!1!==r.hasHeader,i.fullColumnNames=r.columnNames,i.columnConfigs=r.columnConfigs,i.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.util.assert(null==r.delimiter,(function(){return"Delimiter should not be provided when delimWhitespace is true."})),i.delimWhitespace=!0,i.delimiter=" "):i.delimiter=r.delimiter?r.delimiter:",",i}return o(n,t),n.prototype.columnNames=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return this.columnNamesValidated?[3,2]:[4,this.setColumnNames()];case 1:t.sent(),t.label=2;case 2:return[2,this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames]}}))}))},n.prototype.setColumnNames=function(){return u(this,void 0,void 0,(function(){var t,n,r,i,o,u,c,l,f=this;return s(this,(function(s){switch(s.label){case 0:return[4,this.maybeReadHeaderLine()];case 1:if(t=s.sent(),!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");if(this.fullColumnNames&&t&&e.util.assert(t.length===this.fullColumnNames.length,(function(){return"The length of provided columnNames ("+f.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+")."})),this.fullColumnNames||(this.fullColumnNames=t),n=this.fullColumnNames.reduce((function(t,e){return t[e]=t[e]+1||1,t}),{}),r=Object.keys(n).filter((function(t){return n[t]>1})),e.util.assert(0===r.length,(function(){return"Duplicate column names found: "+r.toString()})),this.columnConfigs)try{for(i=a(Object.keys(this.columnConfigs)),o=i.next();!o.done;o=i.next())if(u=o.value,-1===this.fullColumnNames.indexOf(u))throw new Error('The key "'+u+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}catch(t){c={error:t}}finally{try{o&&!o.done&&(l=i.return)&&l.call(i)}finally{if(c)throw c.error}}return this.columnNamesValidated=!0,[2]}}))}))},n.prototype.maybeReadHeaderLine=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:return this.hasHeader?[4,this.base.iterator()]:[3,3];case 1:return[4,n.sent().next()];case 2:if((t=n.sent()).done)throw new Error("No data was found for CSV parsing.");return e=t.value,[2,this.parseRow(e,!1)];case 3:return[2,null]}}))}))},n.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t,e=this;return s(this,(function(n){switch(n.label){case 0:return this.columnNamesValidated?[3,2]:[4,this.setColumnNames()];case 1:n.sent(),n.label=2;case 2:return[4,this.base.iterator()];case 3:return t=n.sent(),this.hasHeader&&(t=t.skip(1)),[2,t.map((function(t){return e.makeDataElement(t)}))]}}))}))},n.prototype.makeDataElement=function(t){for(var e=this.parseRow(t),n={},r={},i=0;i<this.fullColumnNames.length;i++){var o=this.fullColumnNames[i],u=this.columnConfigs?this.columnConfigs[o]:null;if(!this.configuredColumnsOnly||u){var s=e[i],a=null;if(""===s)if(u&&void 0!==u.default)a=u.default;else{if(u&&(u.required||u.isLabel))throw new Error("Required column ".concat(o," is empty in this line: ").concat(t));a=void 0}else{var c=Number(s);if(isNaN(c))a=u&&"bool"===u.dtype?this.getBoolean(s):s;else if(u&&u.dtype)switch(u.dtype){case"float32":default:a=c;break;case"int32":a=Math.floor(c);break;case"bool":a=this.getBoolean(s)}else a=c}u&&u.isLabel?r[o]=a:n[o]=a}}return 0===Object.keys(r).length?n:{xs:n,ys:r}},n.prototype.getBoolean=function(t){return"1"===t||"true"===t.toLowerCase()?1:0},n.prototype.parseRow=function(t,e){void 0===e&&(e=!0);for(var n=[],r=0,i=t.length,o=mt,u=0;u<i;u++)switch(o){case mt:switch(t.charAt(u)){case vt:r=u+1,o=wt;break;case this.delimiter:if(r=u+1," "===this.delimiter&&this.delimWhitespace)break;n.push(""),o=mt;break;default:o=yt,r=u}break;case yt:if(t.charAt(u)===this.delimiter)n.push(t.substring(r,u)),o=mt,r=u+1;break;case wt:if(t.charAt(u)===vt)o=bt;break;case bt:switch(t.charAt(u)){case this.delimiter:n.push(t.substring(r,u-1)),o=mt,r=u+1;break;case vt:o=wt;break;default:o=gt}break;case gt:if(t.charAt(u)===vt)o=wt}if(o===bt?n.push(t.substring(r,i-1)):n.push(t.substring(r)),e&&n.length!==this.fullColumnNames.length)throw new Error("Invalid row in csv file. Should have ".concat(this.fullColumnNames.length," elements in a row, but got ").concat(n));return n},n}(ft),Ct=function(t){function n(e){var n=t.call(this)||this;n.microphoneConfig=e,n.isClosed=!1,n.fftSize=e.fftSize||1024;var r=Math.log2(n.fftSize);if(n.fftSize<0||r<4||r>14||!Number.isInteger(r))throw new Error("Invalid fftSize: it must be a power of 2 between "+"2 to 4 and 2 to 14, but got ".concat(n.fftSize));if(n.numFrames=e.numFramesPerSpectrogram||43,n.sampleRateHz=e.sampleRateHz,n.columnTruncateLength=e.columnTruncateLength||n.fftSize,n.audioTrackConstraints=e.audioTrackConstraints,n.smoothingTimeConstant=e.smoothingTimeConstant||0,n.includeSpectrogram=!1!==e.includeSpectrogram,n.includeWaveform=!0===e.includeWaveform,!n.includeSpectrogram&&!n.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.");return n}return o(n,t),n.prototype.summary=function(){return"microphone"},n.create=function(t){return void 0===t&&(t={}),u(this,void 0,void 0,(function(){var r;return s(this,(function(i){switch(i.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");return[4,(r=new n(t)).start()];case 1:return i.sent(),[2,r]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,e,n,r;return s(this,(function(i){switch(i.label){case 0:return i.trys.push([0,2,,3]),t=this,[4,navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})];case 1:return t.stream=i.sent(),[3,3];case 2:throw e=i.sent(),new Error("Error thrown while initializing video stream: ".concat(e.message));case 3:if(!this.stream)throw new Error("Could not obtain audio from microphone.");if(n=window.AudioContext||window.webkitAudioContext,this.audioContext=new n,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error("Mismatch in sampling rate: "+"Expected: ".concat(this.sampleRateHz,"; ")+"Actual: ".concat(this.audioContext.sampleRate))}else this.sampleRateHz=this.audioContext.sampleRate;return r=this.audioContext.createMediaStreamSource(this.stream),this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,r.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize),[2]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i;return s(this,(function(o){switch(o.label){case 0:return this.isClosed?[2,{value:null,done:!0}]:[4,this.getAudioData()];case 1:return n=o.sent(),this.includeSpectrogram&&(r=this.flattenQueue(n.freqDataQueue),t=this.getTensorFromAudioDataArray(r,[this.numFrames,this.columnTruncateLength,1])),this.includeWaveform&&(i=this.flattenQueue(n.timeDataQueue),e=this.getTensorFromAudioDataArray(i,[this.numFrames*this.fftSize,1])),[2,{value:{spectrogram:t,waveform:e},done:!1}]}}))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.getAudioData=function(){return u(this,void 0,void 0,(function(){var t,e,n,r=this;return s(this,(function(i){return t=[],e=[],n=0,[2,new Promise((function(i){var o=setInterval((function(){r.includeSpectrogram&&(r.analyser.getFloatFrequencyData(r.freqData),r.freqData[0]===-1/0&&i({freqDataQueue:t,timeDataQueue:e}),t.push(r.freqData.slice(0,r.columnTruncateLength))),r.includeWaveform&&(r.analyser.getFloatTimeDomainData(r.timeData),e.push(r.timeData.slice())),++n===r.numFrames&&(clearInterval(o),i({freqDataQueue:t,timeDataQueue:e}))}),r.fftSize/r.sampleRateHz*1e3)}))]}))}))},n.prototype.stop=function(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())},n.prototype.toArray=function(){throw new Error("Can not convert infinite audio stream to array.")},n.prototype.getSampleRate=function(){return this.sampleRateHz},n.prototype.flattenQueue=function(t){var e=t[0].length,n=new Float32Array(t.length*e);return t.forEach((function(t,r){return n.set(t,r*e)})),n},n.prototype.getTensorFromAudioDataArray=function(t,n){var r=new Float32Array(e.util.sizeFromShape(n));return r.set(t,r.length-t.length),e.tensor(r,n)},n}(G),zt=function(t){function n(n,r){var i=t.call(this)||this;if(i.webcamVideoElement=n,i.webcamConfig=r,i.isClosed=!0,i.resize=!1,i.needToResize())if(i.resize=!0,i.cropSize=[i.webcamConfig.resizeHeight,i.webcamConfig.resizeWidth],i.cropBoxInd=e.tensor1d([0],"int32"),i.webcamConfig.centerCrop){var o=1*i.webcamConfig.resizeWidth/i.webcamVideoElement.width,u=1*i.webcamConfig.resizeHeight/i.webcamVideoElement.height,s=(1-o)/2,a=(1-u)/2,c=s+o,l=u+a;i.cropBox=e.tensor2d([a,s,l,c],[1,4])}else i.cropBox=e.tensor2d([0,0,1,1],[1,4]);return i}return o(n,t),n.prototype.summary=function(){return"webcam"},n.create=function(t,r){return void 0===r&&(r={}),u(this,void 0,void 0,(function(){var i;return s(this,(function(o){switch(o.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!r.resizeWidth||!r.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=r.resizeWidth,t.height=r.resizeHeight}return[4,(i=new n(t,r)).start()];case 1:return o.sent(),[2,i]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,n,r=this;return s(this,(function(i){switch(i.label){case 0:this.webcamConfig.facingMode&&e.util.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(function(){return"Invalid webcam facing mode: ".concat(r.webcamConfig.facingMode,". ")+"Please provide 'user' or 'environment'"})),i.label=1;case 1:return i.trys.push([1,3,,4]),t=this,[4,navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})];case 2:return t.stream=i.sent(),[3,4];case 3:throw(n=i.sent()).message="Error thrown while initializing video stream: ".concat(n.message),n;case 4:if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,[2,new Promise((function(t){r.webcamVideoElement.onloadedmetadata=function(){t()}}))]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t;return s(this,(function(n){if(this.isClosed)return[2,{value:null,done:!0}];try{t=e.browser.fromPixels(this.webcamVideoElement)}catch(t){throw new Error("Error thrown converting video to pixels: ".concat(JSON.stringify(t)))}if(!this.resize)return[2,{value:t,done:!1}];try{return[2,{value:this.cropAndResizeFrame(t),done:!1}]}catch(t){throw new Error("Error thrown cropping the video: ".concat(t.message))}finally{t.dispose()}return[2]}))}))},n.prototype.needToResize=function(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)},n.prototype.cropAndResizeFrame=function(t){var n=this;return e.tidy((function(){var r,i=e.expandDims(e.cast(t,"float32"),0),o=(r=e.image.cropAndResize(i,n.cropBox,n.cropBoxInd,n.cropSize,"bilinear")).shape;return e.reshape(r,o.slice(1))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.stop=function(){this.stream.getTracks().forEach((function(t){return t.stop()}));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0},n.prototype.toArray=function(){throw new Error("Can not convert infinite video stream to array.")},n}(G),Et=function(){},St=function(t){function e(){return null!==t&&t.apply(this,arguments)||this}return o(e,t),e.prototype.split=function(t){return new At(this,t)},e}(G),At=function(t){function e(e,n){var r=t.call(this)||this;return r.upstream=e,r.impl=new Rt(e,n),r}return o(e,t),e.prototype.summary=function(){return this.impl.summary()},e.prototype.next=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return[2,this.impl.next()]}))}))},e}(St),Rt=function(t){function e(e,n){var r=t.call(this)||this;return 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t<0&&(t=this.doubledCapacity+t),t}isFull(){return this.length()===this.capacity}isEmpty(){return 0===this.length()}push(t){if(this.isFull())throw new RangeError("Ring buffer is full.");this.set(this.end,t),this.end=this.wrap(this.end+1)}pushAll(t){for(const e of t)this.push(e)}pop(){if(this.isEmpty())throw new RangeError("Ring buffer is empty.");this.end=this.wrap(this.end-1);const t=this.get(this.end);return this.set(this.end,void 0),t}unshift(t){if(this.isFull())throw new RangeError("Ring buffer is full.");this.begin=this.wrap(this.begin-1),this.set(this.begin,t)}shift(){if(this.isEmpty())throw new RangeError("Ring buffer is empty.");const t=this.get(this.begin);return this.set(this.begin,void 0),this.begin=this.wrap(this.begin+1),t}shuffleExcise(t){if(this.isEmpty())throw new RangeError("Ring buffer is empty.");const e=this.wrap(this.begin+t),r=this.get(e);return this.set(e,this.pop()),r}}class B extends M{constructor(){super(B.INITIAL_CAPACITY)}isFull(){return!1}push(t){super.isFull()&&this.expand(),super.push(t)}unshift(t){super.isFull()&&this.expand(),super.unshift(t)}expand(){const t=2*this.capacity,e=new Array(t),r=this.length();for(let t=0;t<r;t++)e[t]=this.get(this.wrap(this.begin+t));this.data=e,this.capacity=t,this.doubledCapacity=2*this.capacity,this.begin=0,this.end=r}}function $(t){return new q(t)}function L(t){return new H(t)}B.INITIAL_CAPACITY=32;class P{async toArray(){const t=[];let e=await this.next();for(;!e.done;)t.push(e.value),e=await this.next();return t}async toArrayForTest(){const t=this.prefetch(100),e=[];let r=await t.next();for(;!r.done;)e.push(r.value),r=await t.next();return e}async resolveFully(){let t=await this.next();for(;!t.done;)t=await this.next()}async resolveWhile(t){let e=await this.next(),r=t(e.value);for(;!e.done&&r;)e=await this.next(),r=t(e.value)}handleErrors(t){return new Z(this,t)}filter(t){return new X(this,t)}map(t){return new G(this,t)}mapAsync(t){return new J(this,t)}serialMapAsync(t){return new J(this,t).serial()}flatmap(t){return new K(this,t)}async forEachAsync(t){return this.map(t).resolveFully()}async serialForEach(t){return this.serialMapAsync(t).resolveWhile((t=>!0===t))}rowMajorBatch(t,e=!0){return new Q(this,t,e)}columnMajorBatch(t,e=!0,r=D){return this.rowMajorBatch(t,e).map((t=>k(t,r)))}concatenate(t,e){return new tt($([this,t]),e)}take(t){return t<0||null==t?this:new U(this,t)}skip(t){return t<0||null==t?this:new V(this,t)}prefetch(t){return new rt(this,t)}shuffle(t,e){return new st(this,t,e)}serial(){return new W(this)}}class q extends P{constructor(t){super(),this.items=t,this.trav=0}summary(){return`Array of ${this.items.length} items`}async next(){if(this.trav>=this.items.length)return{value:null,done:!0};const t=this.items[this.trav];return this.trav++,{value:_(t),done:!1}}}class H extends P{constructor(t){super(),this.nextFn=t}summary(){return"Function call"}async next(){try{return this.nextFn()}catch(t){throw t.message=`Error thrown while iterating through a dataset: ${t.message}`,t}}}class W extends P{constructor(t){super(),this.upstream=t,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> Serial`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){return this.upstream.next()}}class V extends P{constructor(t,e){super(),this.upstream=t,this.maxCount=e,this.count=0,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> Skip`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;this.count++<this.maxCount;){const t=await this.upstream.next();if(t.done)return t;s.dispose(t.value)}return this.upstream.next()}}class U extends P{constructor(t,e){super(),this.upstream=t,this.maxCount=e,this.count=0}summary(){return`${this.upstream.summary()} -> Take`}async next(){return this.count++>=this.maxCount?{value:null,done:!0}:this.upstream.next()}}class Q extends P{constructor(t,e,r=!0){super(),this.upstream=t,this.batchSize=e,this.enableSmallLastBatch=r,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> RowMajorBatch`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){const t=[];for(;t.length<this.batchSize;){const e=await this.upstream.next();if(e.done)return this.enableSmallLastBatch&&t.length>0?{value:t,done:!1}:{value:null,done:!0};t.push(e.value)}return{value:t,done:!1}}}class X extends P{constructor(t,e){super(),this.upstream=t,this.predicate=e,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> Filter`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;){const t=await this.upstream.next();if(t.done||this.predicate(t.value))return t;s.dispose(t.value)}}}class G extends P{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Map`}async next(){const t=await this.upstream.next();if(t.done)return{value:null,done:!0};const e=s.tensor_util.getTensorsInContainer(t.value),r=this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return{value:r,done:!1}}}class Z extends P{constructor(t,e){super(),this.upstream=t,this.handler=e,this.count=0,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> handleErrors`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;)try{return await this.upstream.next()}catch(t){if(!this.handler(t))return{value:null,done:!0}}}}class J extends P{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> AsyncMap`}async next(){const t=await this.upstream.next();if(t.done)return{value:null,done:!0};const e=s.tensor_util.getTensorsInContainer(t.value),r=await this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return{value:r,done:!1}}}class Y extends P{constructor(){super(),this.outputQueue=new B,this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;0===this.outputQueue.length();)if(!await this.pump())return{value:null,done:!0};return{value:this.outputQueue.shift(),done:!1}}}class K extends Y{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Flatmap`}async pump(){const t=await this.upstream.next();if(t.done)return!1;const e=s.tensor_util.getTensorsInContainer(t.value),r=this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);this.outputQueue.pushAll(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return!0}}class tt extends P{constructor(t,e){super(),this.baseErrorHandler=e,this.lastRead=null,this.iterator=null,this.moreIterators=t}summary(){return"TODO: fill in upstream of chained summaries -> Chained"}async next(){return this.lastRead=this.readFromChain(this.lastRead),this.lastRead}async readFromChain(t){if(await t,null==this.iterator){const t=await this.moreIterators.next();if(t.done)return{value:null,done:!0};this.iterator=t.value,null!=this.baseErrorHandler&&(this.iterator=this.iterator.handleErrors(this.baseErrorHandler))}const e=await this.iterator.next();return e.done?(this.iterator=null,this.readFromChain(t)):e}}!function(t){t[t.FAIL=0]="FAIL",t[t.SHORTEST=1]="SHORTEST",t[t.LONGEST=2]="LONGEST"}(A||(A={}));class et extends P{constructor(t,e=A.FAIL){super(),this.iterators=t,this.mismatchMode=e,this.count=0,this.currentPromise=null}summary(){return"{TODO: fill in upstream of zip summaries} -> Zip"}async nextState(t){await t;let e=0,r=0;const s=await I(this.iterators,(function(t){if(t instanceof P){return{value:t.next().then((t=>(e++,t.done&&r++,t.value))),recurse:!1}}return{value:null,recurse:!0}}));if(e===r)return{value:null,done:!0};if(r>0)switch(this.mismatchMode){case A.FAIL:throw new Error(`Zipped streams should have the same length. Mismatched at element ${this.count}.`);case A.SHORTEST:return{value:null,done:!0};case A.LONGEST:}return this.count++,{value:s,done:!1}}async next(){return this.currentPromise=this.nextState(this.currentPromise),this.currentPromise}}class rt extends P{constructor(t,e){super(),this.upstream=t,this.bufferSize=e,this.buffer=new M(e)}summary(){return`${this.upstream.summary()} -> Prefetch`}refill(){for(;!this.buffer.isFull();){const t=this.upstream.next();this.buffer.push(t)}}next(){return this.refill(),this.buffer.shift()}}class st extends rt{constructor(t,e,r){super(t,e),this.upstream=t,this.windowSize=e,this.upstreamExhausted=!1,this.random=T.alea(r||s.util.now().toString()),this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}randomInt(t){return Math.floor(this.random()*t)}chooseIndex(){return this.randomInt(this.buffer.length())}async serialNext(){for(this.upstreamExhausted||this.refill();!this.buffer.isEmpty();){const t=this.chooseIndex(),e=await this.buffer.shuffleExcise(t);if(!e.done)return this.refill(),e;this.upstreamExhausted=!0}return{value:null,done:!0}}}class nt{constructor(){this.size=null}batch(t,e=!0){const r=this;let n;return s.util.assert(t>0,(()=>`batchSize needs to be positive, but it is\n      ${t}`)),n=this.size===1/0||null==this.size?this.size:e?Math.ceil(this.size/t):Math.floor(this.size/t),it((async()=>(await r.iterator()).columnMajorBatch(t,e,at)),n)}concatenate(t){const e=this;let r;return r=this.size===1/0||t.size===1/0?1/0:null!=this.size&&null!=t.size?this.size+t.size:null,it((async()=>(await e.iterator()).concatenate(await t.iterator())),r)}filter(t){const e=this;let r;return r=this.size===1/0?1/0:null,it((async()=>(await e.iterator()).filter((e=>s.tidy((()=>t(e)))))),r)}async forEachAsync(t){return(await this.iterator()).forEachAsync(t)}map(t){const e=this;return it((async()=>(await e.iterator()).map((e=>s.tidy((()=>t(e)))))),this.size)}mapAsync(t){const e=this;return it((async()=>(await e.iterator()).mapAsync(t)),this.size)}prefetch(t){if(null==t)throw new RangeError("`Dataset.prefetch()` requires bufferSize to be specified.");const e=this;return it((async()=>(await e.iterator()).prefetch(t)),this.size)}repeat(t){const e=this;let r;return r=null!=this.size&&t>0?this.size*t:0===t?0:null!=this.size&&(void 0===t||t<0)?1/0:null,it((async()=>{const r=L((async()=>({value:await e.iterator(),done:!1})));return s=r.take(t),new tt(s,n);var s,n}),r)}skip(t){const e=this;let r;return r=null!=this.size&&t>=0&&this.size>=t?this.size-t:null!=this.size&&(this.size<t||void 0===t||t<0)?0:null,it((async()=>(await e.iterator()).skip(t)),r)}shuffle(t,e,r=!0){if(null==t||t<0)throw null==this.size?new RangeError("`Dataset.shuffle()` requires bufferSize to be specified."):new RangeError(`\`Dataset.shuffle()\` requires bufferSize to be specified.  If your data fits in main memory (for regular JS objects), and/or GPU memory (for \`tf.Tensor\`s), consider setting bufferSize to the dataset size (${this.size} elements)`);const n=this,i=T.alea(e||s.util.now().toString());return it((async()=>{let e=i.int32();return r&&(e+=i.int32()),(await n.iterator()).shuffle(t,e.toString())}),this.size)}take(t){const e=this;let r;return r=null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null,it((async()=>(await e.iterator()).take(t)),r)}async toArray(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArray()}async toArrayForTest(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArrayForTest()}}function it(t,e=null){return new class extends nt{constructor(){super(...arguments),this.size=e}async iterator(){return t()}}}function at(t){if(null===t)return null;const e=t[0];if(null==(r=e)||null===(n=r)||"object"!=typeof n&&"function"!=typeof n||Array.isArray(r)||"object"==typeof r&&r instanceof s.Tensor||s.util.isTypedArray(r)){return{value:function(t){if(0===t.length)throw new Error("Can't make a batch of zero elements.");return t[0]instanceof s.Tensor?s.stack(t):s.tensor(t)}(t),recurse:!1}}var r,n;return{value:null,recurse:!0}}nt.MAX_BUFFER_SIZE=1e4;class ot extends nt{constructor(t){super(),this.input=t}async iterator(){return(await this.input.iterator()).decodeUTF8().split("\n").map((t=>(t.endsWith("\r")&&(t=t.slice(0,-1)),t)))}}const ut='"',ht=Symbol("out"),lt=Symbol("field"),ct=Symbol("quote"),ft=Symbol("quoteafterquote"),dt=Symbol("quoteinquote");class mt extends nt{async columnNames(){return this.columnNamesValidated||await this.setColumnNames(),this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames}async setColumnNames(){const t=await this.maybeReadHeaderLine();if(!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");this.fullColumnNames&&t&&e.util.assert(t.length===this.fullColumnNames.length,(()=>"The length of provided columnNames ("+this.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+").")),this.fullColumnNames||(this.fullColumnNames=t);const r=this.fullColumnNames.reduce(((t,e)=>(t[e]=t[e]+1||1,t)),{}),s=Object.keys(r).filter((t=>r[t]>1));if(e.util.assert(0===s.length,(()=>"Duplicate column names found: "+s.toString())),this.columnConfigs)for(const t of Object.keys(this.columnConfigs)){if(-1===this.fullColumnNames.indexOf(t))throw new Error('The key "'+t+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}this.columnNamesValidated=!0}async maybeReadHeaderLine(){if(this.hasHeader){const t=await this.base.iterator(),e=await t.next();if(e.done)throw new Error("No data was found for CSV parsing.");const r=e.value;return this.parseRow(r,!1)}return null}constructor(t,r){super(),this.input=t,this.hasHeader=!0,this.fullColumnNames=null,this.columnNamesValidated=!1,this.columnConfigs=null,this.configuredColumnsOnly=!1,this.delimiter=",",this.delimWhitespace=!1,this.base=new ot(t),r||(r={}),this.hasHeader=!1!==r.hasHeader,this.fullColumnNames=r.columnNames,this.columnConfigs=r.columnConfigs,this.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.util.assert(null==r.delimiter,(()=>"Delimiter should not be provided when delimWhitespace is true.")),this.delimWhitespace=!0,this.delimiter=" "):this.delimiter=r.delimiter?r.delimiter:","}async iterator(){this.columnNamesValidated||await this.setColumnNames();let t=await this.base.iterator();return this.hasHeader&&(t=t.skip(1)),t.map((t=>this.makeDataElement(t)))}makeDataElement(t){const e=this.parseRow(t),r={},s={};for(let n=0;n<this.fullColumnNames.length;n++){const i=this.fullColumnNames[n],a=this.columnConfigs?this.columnConfigs[i]:null;if(!this.configuredColumnsOnly||a){const o=e[n];let u=null;if(""===o)if(a&&void 0!==a.default)u=a.default;else{if(a&&(a.required||a.isLabel))throw new Error(`Required column ${i} is empty in this line: ${t}`);u=void 0}else{const t=Number(o);if(isNaN(t))u=a&&"bool"===a.dtype?this.getBoolean(o):o;else if(a&&a.dtype)switch(a.dtype){case"float32":default:u=t;break;case"int32":u=Math.floor(t);break;case"bool":u=this.getBoolean(o)}else u=t}a&&a.isLabel?s[i]=u:r[i]=u}}return 0===Object.keys(s).length?r:{xs:r,ys:s}}getBoolean(t){return"1"===t||"true"===t.toLowerCase()?1:0}parseRow(t,e=!0){const r=[];let s=0;const n=t.length;let i=ht;for(let e=0;e<n;e++)switch(i){case ht:switch(t.charAt(e)){case ut:s=e+1,i=ct;break;case this.delimiter:if(s=e+1," "===this.delimiter&&this.delimWhitespace)break;r.push(""),i=ht;break;default:i=lt,s=e}break;case lt:if(t.charAt(e)===this.delimiter)r.push(t.substring(s,e)),i=ht,s=e+1;break;case ct:if(t.charAt(e)===ut)i=ft;break;case ft:switch(t.charAt(e)){case this.delimiter:r.push(t.substring(s,e-1)),i=ht,s=e+1;break;case ut:i=ct;break;default:i=dt}break;case dt:if(t.charAt(e)===ut)i=ct}if(i===ft?r.push(t.substring(s,n-1)):r.push(t.substring(s)),e&&r.length!==this.fullColumnNames.length)throw new Error(`Invalid row in csv file. Should have ${this.fullColumnNames.length} elements in a row, but got ${r}`);return r}}class pt extends P{constructor(t){super(),this.microphoneConfig=t,this.isClosed=!1,this.fftSize=t.fftSize||1024;const e=Math.log2(this.fftSize);if(this.fftSize<0||e<4||e>14||!Number.isInteger(e))throw new Error(`Invalid fftSize: it must be a power of 2 between 2 to 4 and 2 to 14, but got ${this.fftSize}`);if(this.numFrames=t.numFramesPerSpectrogram||43,this.sampleRateHz=t.sampleRateHz,this.columnTruncateLength=t.columnTruncateLength||this.fftSize,this.audioTrackConstraints=t.audioTrackConstraints,this.smoothingTimeConstant=t.smoothingTimeConstant||0,this.includeSpectrogram=!1!==t.includeSpectrogram,this.includeWaveform=!0===t.includeWaveform,!this.includeSpectrogram&&!this.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.")}summary(){return"microphone"}static async create(t={}){if(!e.env().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");const r=new pt(t);return await r.start(),r}async start(){try{this.stream=await navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})}catch(t){throw new Error(`Error thrown while initializing video stream: ${t.message}`)}if(!this.stream)throw new Error("Could not obtain audio from microphone.");const t=window.AudioContext||window.webkitAudioContext;if(this.audioContext=new t,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error(`Mismatch in sampling rate: Expected: ${this.sampleRateHz}; Actual: ${this.audioContext.sampleRate}`)}else this.sampleRateHz=this.audioContext.sampleRate;const e=this.audioContext.createMediaStreamSource(this.stream);this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,e.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize)}async next(){if(this.isClosed)return{value:null,done:!0};let t,e;const r=await this.getAudioData();if(this.includeSpectrogram){const e=this.flattenQueue(r.freqDataQueue);t=this.getTensorFromAudioDataArray(e,[this.numFrames,this.columnTruncateLength,1])}if(this.includeWaveform){const t=this.flattenQueue(r.timeDataQueue);e=this.getTensorFromAudioDataArray(t,[this.numFrames*this.fftSize,1])}return{value:{spectrogram:t,waveform:e},done:!1}}async capture(){return(await this.next()).value}async getAudioData(){const t=[],e=[];let r=0;return new Promise((s=>{const n=setInterval((()=>{this.includeSpectrogram&&(this.analyser.getFloatFrequencyData(this.freqData),this.freqData[0]===-1/0&&s({freqDataQueue:t,timeDataQueue:e}),t.push(this.freqData.slice(0,this.columnTruncateLength))),this.includeWaveform&&(this.analyser.getFloatTimeDomainData(this.timeData),e.push(this.timeData.slice())),++r===this.numFrames&&(clearInterval(n),s({freqDataQueue:t,timeDataQueue:e}))}),this.fftSize/this.sampleRateHz*1e3)}))}stop(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())}toArray(){throw new Error("Can not convert infinite audio stream to array.")}getSampleRate(){return this.sampleRateHz}flattenQueue(t){const e=t[0].length,r=new Float32Array(t.length*e);return t.forEach(((t,s)=>r.set(t,s*e))),r}getTensorFromAudioDataArray(t,r){const s=new Float32Array(e.util.sizeFromShape(r));return s.set(t,s.length-t.length),e.tensor(s,r)}}class wt extends P{constructor(t,r){if(super(),this.webcamVideoElement=t,this.webcamConfig=r,this.isClosed=!0,this.resize=!1,this.needToResize())if(this.resize=!0,this.cropSize=[this.webcamConfig.resizeHeight,this.webcamConfig.resizeWidth],this.cropBoxInd=e.tensor1d([0],"int32"),this.webcamConfig.centerCrop){const t=1*this.webcamConfig.resizeWidth/this.webcamVideoElement.width,r=1*this.webcamConfig.resizeHeight/this.webcamVideoElement.height,s=(1-t)/2,n=(1-r)/2,i=s+t,a=r+n;this.cropBox=e.tensor2d([n,s,a,i],[1,4])}else this.cropBox=e.tensor2d([0,0,1,1],[1,4])}summary(){return"webcam"}static async create(t,r={}){if(!e.env().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!r.resizeWidth||!r.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=r.resizeWidth,t.height=r.resizeHeight}const s=new wt(t,r);return await s.start(),s}async start(){this.webcamConfig.facingMode&&e.util.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(()=>`Invalid webcam facing mode: ${this.webcamConfig.facingMode}. Please provide 'user' or 'environment'`));try{this.stream=await navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})}catch(t){throw t.message=`Error thrown while initializing video stream: ${t.message}`,t}if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,new Promise((t=>{this.webcamVideoElement.onloadedmetadata=()=>{t()}}))}async next(){if(this.isClosed)return{value:null,done:!0};let t;try{t=e.browser.fromPixels(this.webcamVideoElement)}catch(t){throw new Error(`Error thrown converting video to pixels: ${JSON.stringify(t)}`)}if(!this.resize)return{value:t,done:!1};try{return{value:this.cropAndResizeFrame(t),done:!1}}catch(t){throw new Error(`Error thrown cropping the video: ${t.message}`)}finally{t.dispose()}}needToResize(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)}cropAndResizeFrame(t){return e.tidy((()=>{const r=e.expandDims(e.cast(t,"float32"),0);let s;s=e.image.cropAndResize(r,this.cropBox,this.cropBoxInd,this.cropSize,"bilinear");const n=s.shape;return e.reshape(s,n.slice(1))}))}async capture(){return(await this.next()).value}stop(){this.stream.getTracks().forEach((t=>t.stop()));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0}toArray(){throw new Error("Can not convert infinite video stream to array.")}}class yt{}class gt extends P{split(t){return new xt(this,t)}}class xt extends gt{constructor(t,e){super(),this.upstream=t,this.impl=new vt(t,e)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class vt extends Y{constructor(t,e){super(),this.upstream=t,this.separator=e,this.carryover=""}summary(){return`${this.upstream.summary()} -> Split('${this.separator}')`}async pump(){const t=await this.upstream.next();if(t.done)return""!==this.carryover&&(this.outputQueue.push(this.carryover),this.carryover="",!0);const e=t.value.split(this.separator);e[0]=this.carryover+e[0];for(const t of e.slice(0,-1))this.outputQueue.push(t);return this.carryover=e[e.length-1],!0}}class bt extends P{decodeUTF8(){return new Ct(this)}}class Ct extends gt{constructor(t){super(),this.upstream=t,this.impl=new zt(t)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class zt extends Y{constructor(t){if(super(),this.upstream=t,e.env().get("IS_BROWSER"))this.decoder=new TextDecoder("utf-8");else{const{StringDecoder:t}=require("string_decoder");this.decoder=new t("utf8")}}summary(){return`${this.upstream.summary()} -> Utf8`}async pump(){const t=await this.upstream.next();let r,s;return!t.done&&(r=t.value,s=e.env().get("IS_BROWSER")?this.decoder.decode(r,{stream:!0}):this.decoder.write(Buffer.from(r.buffer)),this.outputQueue.push(s),!0)}}class Et extends bt{constructor(t,r={}){super(),this.file=t,this.options=r,e.util.assert(t instanceof Uint8Array||!!e.env().get("IS_BROWSER")&&(t instanceof File||t instanceof Blob),(()=>"FileChunkIterator only supports File, Blob and Uint8Array right now.")),this.offset=r.offset||0,this.chunkSize=r.chunkSize||1048576}summary(){return`FileChunks ${this.file}`}async next(){if(this.offset>=(this.file instanceof Uint8Array?this.file.byteLength:this.file.size))return{value:null,done:!0};const t=new Promise(((t,e)=>{const r=this.offset+this.chunkSize;if(this.file instanceof Uint8Array)t(new Uint8Array(this.file.slice(this.offset,r)));else{const s=new FileReader;s.onload=r=>{let n=s.result;if(n instanceof ArrayBuffer&&(n=new Uint8Array(n)),!(n instanceof Uint8Array))return e(new TypeError("FileReader returned unknown type."));t(n)},s.onabort=t=>e(new Error("Aborted")),s.onerror=t=>e(new Error(t.type));const n=this.file.slice(this.offset,r);s.readAsArrayBuffer(n)}this.offset=r}));return{value:await t,done:!1}}}const St=t=>({method:t.method,headers:t.headers,body:t.body,mode:t.mode,credentials:t.credentials,cache:t.cache,redirect:t.redirect,referrer:t.referrer,integrity:t.integrity});function Rt(t){return"string"==typeof t&&"file://"===t.slice(0,7)}class At extends yt{constructor(t,e={}){super(),this.input=t,this.options=e}async iterator(){if(Rt(this.input)&&e.env().get("IS_NODE")){const t=require("fs");this.input=t.readFileSync(this.input.slice(7))}return new Et(this.input,this.options)}}class Tt extends yt{constructor(t,e={}){super(),this.url=t,this.fileOptions=e}async iterator(){return Rt(this.url)?new At(this.url,this.fileOptions).iterator():async function(t,r={},s){let n,i;"string"==typeof t?n=t:(n=t.url,i=St(t));const a=await(s||e.util.fetch)(n,i);if(a.ok){const t=new Uint8Array(await a.arrayBuffer());return new Et(t,r)}throw new Error(a.statusText)}(this.url,this.fileOptions)}}t.CSVDataset=mt,t.Dataset=nt,t.FileDataSource=At,t.TextLineDataset=ot,t.URLDataSource=Tt,t.array=function(t){return it((async()=>$(t)),t.length)},t.csv=function(t,e={}){return new mt(new Tt(t),e)},t.func=function(t){const e=L(t);return it((async()=>e))},t.generator=function(t){return it((async()=>{const e=await t();return L((()=>e.next()))}))},t.microphone=async function(t){return pt.create(t)},t.version_data="4.5.0",t.webcam=async function(t,e){return wt.create(t,e)},t.zip=function(t){if(!O(t))throw new Error("The argument to zip() must be an object or array.");let e;if(Array.isArray(t))for(let r=0;r<t.length;r++)e=null==e?t[r].size:Math.min(e,t[r].size);else if(t 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G(this,t)}mapAsync(t){return new J(this,t)}serialMapAsync(t){return new J(this,t).serial()}flatmap(t){return new K(this,t)}async forEachAsync(t){return this.map(t).resolveFully()}async serialForEach(t){return this.serialMapAsync(t).resolveWhile((t=>!0===t))}rowMajorBatch(t,e=!0){return new Q(this,t,e)}columnMajorBatch(t,e=!0,r=D){return this.rowMajorBatch(t,e).map((t=>k(t,r)))}concatenate(t,e){return new tt($([this,t]),e)}take(t){return t<0||null==t?this:new U(this,t)}skip(t){return t<0||null==t?this:new V(this,t)}prefetch(t){return new rt(this,t)}shuffle(t,e){return new st(this,t,e)}serial(){return new W(this)}}class q extends P{constructor(t){super(),this.items=t,this.trav=0}summary(){return`Array of ${this.items.length} items`}async next(){if(this.trav>=this.items.length)return{value:null,done:!0};const t=this.items[this.trav];return this.trav++,{value:_(t),done:!1}}}class H extends P{constructor(t){super(),this.nextFn=t}summary(){return"Function call"}async next(){try{return 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next(){return this.count++>=this.maxCount?{value:null,done:!0}:this.upstream.next()}}class Q extends P{constructor(t,e,r=!0){super(),this.upstream=t,this.batchSize=e,this.enableSmallLastBatch=r,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> RowMajorBatch`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){const t=[];for(;t.length<this.batchSize;){const e=await this.upstream.next();if(e.done)return this.enableSmallLastBatch&&t.length>0?{value:t,done:!1}:{value:null,done:!0};t.push(e.value)}return{value:t,done:!1}}}class X extends P{constructor(t,e){super(),this.upstream=t,this.predicate=e,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> Filter`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;){const t=await this.upstream.next();if(t.done||this.predicate(t.value))return t;s.dispose(t.value)}}}class G extends P{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Map`}async next(){const t=await this.upstream.next();if(t.done)return{value:null,done:!0};const e=s.tensor_util.getTensorsInContainer(t.value),r=this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return{value:r,done:!1}}}class Z extends P{constructor(t,e){super(),this.upstream=t,this.handler=e,this.count=0,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> handleErrors`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;)try{return await this.upstream.next()}catch(t){if(!this.handler(t))return{value:null,done:!0}}}}class J extends P{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> AsyncMap`}async next(){const t=await this.upstream.next();if(t.done)return{value:null,done:!0};const e=s.tensor_util.getTensorsInContainer(t.value),r=await this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return{value:r,done:!1}}}class Y extends P{constructor(){super(),this.outputQueue=new B,this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;0===this.outputQueue.length();)if(!await this.pump())return{value:null,done:!0};return{value:this.outputQueue.shift(),done:!1}}}class K extends Y{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Flatmap`}async pump(){const t=await this.upstream.next();if(t.done)return!1;const e=s.tensor_util.getTensorsInContainer(t.value),r=this.transform(t.value),n=s.tensor_util.getTensorsInContainer(r);this.outputQueue.pushAll(r);for(const t of e)s.tensor_util.isTensorInList(t,n)||t.dispose();return!0}}class tt extends P{constructor(t,e){super(),this.baseErrorHandler=e,this.lastRead=null,this.iterator=null,this.moreIterators=t}summary(){return"TODO: fill in upstream of chained summaries -> Chained"}async next(){return this.lastRead=this.readFromChain(this.lastRead),this.lastRead}async readFromChain(t){if(await t,null==this.iterator){const t=await this.moreIterators.next();if(t.done)return{value:null,done:!0};this.iterator=t.value,null!=this.baseErrorHandler&&(this.iterator=this.iterator.handleErrors(this.baseErrorHandler))}const e=await this.iterator.next();return e.done?(this.iterator=null,this.readFromChain(t)):e}}!function(t){t[t.FAIL=0]="FAIL",t[t.SHORTEST=1]="SHORTEST",t[t.LONGEST=2]="LONGEST"}(A||(A={}));class et extends P{constructor(t,e=A.FAIL){super(),this.iterators=t,this.mismatchMode=e,this.count=0,this.currentPromise=null}summary(){return"{TODO: fill in upstream of zip summaries} -> Zip"}async nextState(t){await t;let e=0,r=0;const s=await I(this.iterators,(function(t){if(t instanceof P){return{value:t.next().then((t=>(e++,t.done&&r++,t.value))),recurse:!1}}return{value:null,recurse:!0}}));if(e===r)return{value:null,done:!0};if(r>0)switch(this.mismatchMode){case A.FAIL:throw new Error(`Zipped streams should have the same length. Mismatched at element ${this.count}.`);case A.SHORTEST:return{value:null,done:!0};case A.LONGEST:}return this.count++,{value:s,done:!1}}async next(){return this.currentPromise=this.nextState(this.currentPromise),this.currentPromise}}class rt extends P{constructor(t,e){super(),this.upstream=t,this.bufferSize=e,this.buffer=new M(e)}summary(){return`${this.upstream.summary()} -> Prefetch`}refill(){for(;!this.buffer.isFull();){const t=this.upstream.next();this.buffer.push(t)}}next(){return this.refill(),this.buffer.shift()}}class st extends rt{constructor(t,e,r){super(t,e),this.upstream=t,this.windowSize=e,this.upstreamExhausted=!1,this.random=T.alea(r||s.util.now().toString()),this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}randomInt(t){return Math.floor(this.random()*t)}chooseIndex(){return this.randomInt(this.buffer.length())}async serialNext(){for(this.upstreamExhausted||this.refill();!this.buffer.isEmpty();){const t=this.chooseIndex(),e=await this.buffer.shuffleExcise(t);if(!e.done)return this.refill(),e;this.upstreamExhausted=!0}return{value:null,done:!0}}}class nt{constructor(){this.size=null}batch(t,e=!0){const r=this;let n;return s.util.assert(t>0,(()=>`batchSize needs to be positive, but it is\n      ${t}`)),n=this.size===1/0||null==this.size?this.size:e?Math.ceil(this.size/t):Math.floor(this.size/t),it((async()=>(await r.iterator()).columnMajorBatch(t,e,at)),n)}concatenate(t){const e=this;let r;return r=this.size===1/0||t.size===1/0?1/0:null!=this.size&&null!=t.size?this.size+t.size:null,it((async()=>(await e.iterator()).concatenate(await t.iterator())),r)}filter(t){const e=this;let r;return r=this.size===1/0?1/0:null,it((async()=>(await e.iterator()).filter((e=>s.tidy((()=>t(e)))))),r)}async forEachAsync(t){return(await this.iterator()).forEachAsync(t)}map(t){const e=this;return it((async()=>(await e.iterator()).map((e=>s.tidy((()=>t(e)))))),this.size)}mapAsync(t){const e=this;return it((async()=>(await e.iterator()).mapAsync(t)),this.size)}prefetch(t){if(null==t)throw new RangeError("`Dataset.prefetch()` requires bufferSize to be specified.");const e=this;return it((async()=>(await e.iterator()).prefetch(t)),this.size)}repeat(t){const e=this;let r;return r=null!=this.size&&t>0?this.size*t:0===t?0:null!=this.size&&(void 0===t||t<0)?1/0:null,it((async()=>{const r=L((async()=>({value:await e.iterator(),done:!1})));return s=r.take(t),new tt(s,n);var s,n}),r)}skip(t){const e=this;let r;return r=null!=this.size&&t>=0&&this.size>=t?this.size-t:null!=this.size&&(this.size<t||void 0===t||t<0)?0:null,it((async()=>(await e.iterator()).skip(t)),r)}shuffle(t,e,r=!0){if(null==t||t<0)throw null==this.size?new RangeError("`Dataset.shuffle()` requires bufferSize to be specified."):new RangeError(`\`Dataset.shuffle()\` requires bufferSize to be specified.  If your data fits in main memory (for regular JS objects), and/or GPU memory (for \`tf.Tensor\`s), consider setting bufferSize to the dataset size (${this.size} elements)`);const n=this,i=T.alea(e||s.util.now().toString());return it((async()=>{let e=i.int32();return r&&(e+=i.int32()),(await n.iterator()).shuffle(t,e.toString())}),this.size)}take(t){const e=this;let r;return r=null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null,it((async()=>(await e.iterator()).take(t)),r)}async toArray(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArray()}async toArrayForTest(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArrayForTest()}}function it(t,e=null){return new class extends nt{constructor(){super(...arguments),this.size=e}async iterator(){return t()}}}function at(t){if(null===t)return null;const e=t[0];if(null==(r=e)||null===(n=r)||"object"!=typeof n&&"function"!=typeof n||Array.isArray(r)||"object"==typeof r&&r instanceof s.Tensor||s.util.isTypedArray(r)){return{value:function(t){if(0===t.length)throw new Error("Can't make a batch of zero elements.");return t[0]instanceof s.Tensor?s.stack(t):s.tensor(t)}(t),recurse:!1}}var r,n;return{value:null,recurse:!0}}nt.MAX_BUFFER_SIZE=1e4;class ot extends nt{constructor(t){super(),this.input=t}async iterator(){return(await this.input.iterator()).decodeUTF8().split("\n").map((t=>(t.endsWith("\r")&&(t=t.slice(0,-1)),t)))}}const ut='"',ht=Symbol("out"),lt=Symbol("field"),ct=Symbol("quote"),ft=Symbol("quoteafterquote"),dt=Symbol("quoteinquote");class mt extends nt{async columnNames(){return this.columnNamesValidated||await this.setColumnNames(),this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames}async setColumnNames(){const t=await this.maybeReadHeaderLine();if(!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");this.fullColumnNames&&t&&e.util.assert(t.length===this.fullColumnNames.length,(()=>"The length of provided columnNames ("+this.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+").")),this.fullColumnNames||(this.fullColumnNames=t);const r=this.fullColumnNames.reduce(((t,e)=>(t[e]=t[e]+1||1,t)),{}),s=Object.keys(r).filter((t=>r[t]>1));if(e.util.assert(0===s.length,(()=>"Duplicate column names found: "+s.toString())),this.columnConfigs)for(const t of Object.keys(this.columnConfigs)){if(-1===this.fullColumnNames.indexOf(t))throw new Error('The key "'+t+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}this.columnNamesValidated=!0}async maybeReadHeaderLine(){if(this.hasHeader){const t=await this.base.iterator(),e=await t.next();if(e.done)throw new Error("No data was found for CSV parsing.");const r=e.value;return this.parseRow(r,!1)}return null}constructor(t,r){super(),this.input=t,this.hasHeader=!0,this.fullColumnNames=null,this.columnNamesValidated=!1,this.columnConfigs=null,this.configuredColumnsOnly=!1,this.delimiter=",",this.delimWhitespace=!1,this.base=new ot(t),r||(r={}),this.hasHeader=!1!==r.hasHeader,this.fullColumnNames=r.columnNames,this.columnConfigs=r.columnConfigs,this.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.util.assert(null==r.delimiter,(()=>"Delimiter should not be provided when delimWhitespace is true.")),this.delimWhitespace=!0,this.delimiter=" "):this.delimiter=r.delimiter?r.delimiter:","}async iterator(){this.columnNamesValidated||await this.setColumnNames();let t=await this.base.iterator();return this.hasHeader&&(t=t.skip(1)),t.map((t=>this.makeDataElement(t)))}makeDataElement(t){const e=this.parseRow(t),r={},s={};for(let n=0;n<this.fullColumnNames.length;n++){const i=this.fullColumnNames[n],a=this.columnConfigs?this.columnConfigs[i]:null;if(!this.configuredColumnsOnly||a){const o=e[n];let u=null;if(""===o)if(a&&void 0!==a.default)u=a.default;else{if(a&&(a.required||a.isLabel))throw new Error(`Required column ${i} is empty in this line: ${t}`);u=void 0}else{const t=Number(o);if(isNaN(t))u=a&&"bool"===a.dtype?this.getBoolean(o):o;else if(a&&a.dtype)switch(a.dtype){case"float32":default:u=t;break;case"int32":u=Math.floor(t);break;case"bool":u=this.getBoolean(o)}else u=t}a&&a.isLabel?s[i]=u:r[i]=u}}return 0===Object.keys(s).length?r:{xs:r,ys:s}}getBoolean(t){return"1"===t||"true"===t.toLowerCase()?1:0}parseRow(t,e=!0){const r=[];let s=0;const n=t.length;let i=ht;for(let e=0;e<n;e++)switch(i){case ht:switch(t.charAt(e)){case ut:s=e+1,i=ct;break;case this.delimiter:if(s=e+1," "===this.delimiter&&this.delimWhitespace)break;r.push(""),i=ht;break;default:i=lt,s=e}break;case lt:if(t.charAt(e)===this.delimiter)r.push(t.substring(s,e)),i=ht,s=e+1;break;case ct:if(t.charAt(e)===ut)i=ft;break;case ft:switch(t.charAt(e)){case this.delimiter:r.push(t.substring(s,e-1)),i=ht,s=e+1;break;case ut:i=ct;break;default:i=dt}break;case dt:if(t.charAt(e)===ut)i=ct}if(i===ft?r.push(t.substring(s,n-1)):r.push(t.substring(s)),e&&r.length!==this.fullColumnNames.length)throw new Error(`Invalid row in csv file. Should have ${this.fullColumnNames.length} elements in a row, but got ${r}`);return r}}class pt extends P{constructor(t){super(),this.microphoneConfig=t,this.isClosed=!1,this.fftSize=t.fftSize||1024;const e=Math.log2(this.fftSize);if(this.fftSize<0||e<4||e>14||!Number.isInteger(e))throw new Error(`Invalid fftSize: it must be a power of 2 between 2 to 4 and 2 to 14, but got ${this.fftSize}`);if(this.numFrames=t.numFramesPerSpectrogram||43,this.sampleRateHz=t.sampleRateHz,this.columnTruncateLength=t.columnTruncateLength||this.fftSize,this.audioTrackConstraints=t.audioTrackConstraints,this.smoothingTimeConstant=t.smoothingTimeConstant||0,this.includeSpectrogram=!1!==t.includeSpectrogram,this.includeWaveform=!0===t.includeWaveform,!this.includeSpectrogram&&!this.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.")}summary(){return"microphone"}static async create(t={}){if(!e.env().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");const r=new pt(t);return await r.start(),r}async start(){try{this.stream=await navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})}catch(t){throw new Error(`Error thrown while initializing video stream: ${t.message}`)}if(!this.stream)throw new Error("Could not obtain audio from microphone.");const t=window.AudioContext||window.webkitAudioContext;if(this.audioContext=new t,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error(`Mismatch in sampling rate: Expected: ${this.sampleRateHz}; Actual: ${this.audioContext.sampleRate}`)}else this.sampleRateHz=this.audioContext.sampleRate;const e=this.audioContext.createMediaStreamSource(this.stream);this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,e.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize)}async next(){if(this.isClosed)return{value:null,done:!0};let t,e;const r=await this.getAudioData();if(this.includeSpectrogram){const e=this.flattenQueue(r.freqDataQueue);t=this.getTensorFromAudioDataArray(e,[this.numFrames,this.columnTruncateLength,1])}if(this.includeWaveform){const t=this.flattenQueue(r.timeDataQueue);e=this.getTensorFromAudioDataArray(t,[this.numFrames*this.fftSize,1])}return{value:{spectrogram:t,waveform:e},done:!1}}async capture(){return(await this.next()).value}async getAudioData(){const t=[],e=[];let r=0;return new Promise((s=>{const n=setInterval((()=>{this.includeSpectrogram&&(this.analyser.getFloatFrequencyData(this.freqData),this.freqData[0]===-1/0&&s({freqDataQueue:t,timeDataQueue:e}),t.push(this.freqData.slice(0,this.columnTruncateLength))),this.includeWaveform&&(this.analyser.getFloatTimeDomainData(this.timeData),e.push(this.timeData.slice())),++r===this.numFrames&&(clearInterval(n),s({freqDataQueue:t,timeDataQueue:e}))}),this.fftSize/this.sampleRateHz*1e3)}))}stop(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())}toArray(){throw new Error("Can not convert infinite audio stream to array.")}getSampleRate(){return this.sampleRateHz}flattenQueue(t){const e=t[0].length,r=new Float32Array(t.length*e);return t.forEach(((t,s)=>r.set(t,s*e))),r}getTensorFromAudioDataArray(t,r){const s=new Float32Array(e.util.sizeFromShape(r));return s.set(t,s.length-t.length),e.tensor(s,r)}}class wt extends P{constructor(t,r){if(super(),this.webcamVideoElement=t,this.webcamConfig=r,this.isClosed=!0,this.resize=!1,this.needToResize())if(this.resize=!0,this.cropSize=[this.webcamConfig.resizeHeight,this.webcamConfig.resizeWidth],this.cropBoxInd=e.tensor1d([0],"int32"),this.webcamConfig.centerCrop){const t=1*this.webcamConfig.resizeWidth/this.webcamVideoElement.width,r=1*this.webcamConfig.resizeHeight/this.webcamVideoElement.height,s=(1-t)/2,n=(1-r)/2,i=s+t,a=r+n;this.cropBox=e.tensor2d([n,s,a,i],[1,4])}else this.cropBox=e.tensor2d([0,0,1,1],[1,4])}summary(){return"webcam"}static async create(t,r={}){if(!e.env().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!r.resizeWidth||!r.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=r.resizeWidth,t.height=r.resizeHeight}const s=new wt(t,r);return await s.start(),s}async start(){this.webcamConfig.facingMode&&e.util.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(()=>`Invalid webcam facing mode: ${this.webcamConfig.facingMode}. Please provide 'user' or 'environment'`));try{this.stream=await navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})}catch(t){throw t.message=`Error thrown while initializing video stream: ${t.message}`,t}if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,new Promise((t=>{this.webcamVideoElement.onloadedmetadata=()=>{t()}}))}async next(){if(this.isClosed)return{value:null,done:!0};let t;try{t=e.browser.fromPixels(this.webcamVideoElement)}catch(t){throw new Error(`Error thrown converting video to pixels: ${JSON.stringify(t)}`)}if(!this.resize)return{value:t,done:!1};try{return{value:this.cropAndResizeFrame(t),done:!1}}catch(t){throw new Error(`Error thrown cropping the video: ${t.message}`)}finally{t.dispose()}}needToResize(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)}cropAndResizeFrame(t){return e.tidy((()=>{const r=e.expandDims(e.cast(t,"float32"),0);let s;s=e.image.cropAndResize(r,this.cropBox,this.cropBoxInd,this.cropSize,"bilinear");const n=s.shape;return e.reshape(s,n.slice(1))}))}async capture(){return(await this.next()).value}stop(){this.stream.getTracks().forEach((t=>t.stop()));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0}toArray(){throw new Error("Can not convert infinite video stream to array.")}}class yt{}class gt extends P{split(t){return new xt(this,t)}}class xt extends gt{constructor(t,e){super(),this.upstream=t,this.impl=new vt(t,e)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class vt extends Y{constructor(t,e){super(),this.upstream=t,this.separator=e,this.carryover=""}summary(){return`${this.upstream.summary()} -> Split('${this.separator}')`}async pump(){const t=await this.upstream.next();if(t.done)return""!==this.carryover&&(this.outputQueue.push(this.carryover),this.carryover="",!0);const e=t.value.split(this.separator);e[0]=this.carryover+e[0];for(const t of e.slice(0,-1))this.outputQueue.push(t);return this.carryover=e[e.length-1],!0}}class bt extends P{decodeUTF8(){return new Ct(this)}}class Ct extends gt{constructor(t){super(),this.upstream=t,this.impl=new zt(t)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class zt extends Y{constructor(t){if(super(),this.upstream=t,e.env().get("IS_BROWSER"))this.decoder=new TextDecoder("utf-8");else{const{StringDecoder:t}=require("string_decoder");this.decoder=new t("utf8")}}summary(){return`${this.upstream.summary()} -> Utf8`}async pump(){const t=await this.upstream.next();let r,s;return!t.done&&(r=t.value,s=e.env().get("IS_BROWSER")?this.decoder.decode(r,{stream:!0}):this.decoder.write(Buffer.from(r.buffer)),this.outputQueue.push(s),!0)}}class Et extends bt{constructor(t,r={}){super(),this.file=t,this.options=r,e.util.assert(t instanceof Uint8Array||!!e.env().get("IS_BROWSER")&&(t instanceof File||t instanceof Blob),(()=>"FileChunkIterator only supports File, Blob and Uint8Array right now.")),this.offset=r.offset||0,this.chunkSize=r.chunkSize||1048576}summary(){return`FileChunks ${this.file}`}async next(){if(this.offset>=(this.file instanceof Uint8Array?this.file.byteLength:this.file.size))return{value:null,done:!0};const t=new Promise(((t,e)=>{const r=this.offset+this.chunkSize;if(this.file instanceof Uint8Array)t(new Uint8Array(this.file.slice(this.offset,r)));else{const s=new FileReader;s.onload=r=>{let n=s.result;if(n instanceof ArrayBuffer&&(n=new Uint8Array(n)),!(n instanceof Uint8Array))return e(new TypeError("FileReader returned unknown type."));t(n)},s.onabort=t=>e(new Error("Aborted")),s.onerror=t=>e(new Error(t.type));const n=this.file.slice(this.offset,r);s.readAsArrayBuffer(n)}this.offset=r}));return{value:await t,done:!1}}}const St=t=>({method:t.method,headers:t.headers,body:t.body,mode:t.mode,credentials:t.credentials,cache:t.cache,redirect:t.redirect,referrer:t.referrer,integrity:t.integrity});function Rt(t){return"string"==typeof t&&"file://"===t.slice(0,7)}class At extends yt{constructor(t,e={}){super(),this.input=t,this.options=e}async iterator(){if(Rt(this.input)&&e.env().get("IS_NODE")){const t=require("fs");this.input=t.readFileSync(this.input.slice(7))}return new Et(this.input,this.options)}}class Tt extends yt{constructor(t,e={}){super(),this.url=t,this.fileOptions=e}async iterator(){return Rt(this.url)?new At(this.url,this.fileOptions).iterator():async function(t,r={},s){let n,i;"string"==typeof t?n=t:(n=t.url,i=St(t));const a=await(s||e.util.fetch)(n,i);if(a.ok){const t=new Uint8Array(await a.arrayBuffer());return new Et(t,r)}throw new Error(a.statusText)}(this.url,this.fileOptions)}}t.CSVDataset=mt,t.Dataset=nt,t.FileDataSource=At,t.TextLineDataset=ot,t.URLDataSource=Tt,t.array=function(t){return it((async()=>$(t)),t.length)},t.csv=function(t,e={}){return new mt(new Tt(t),e)},t.func=function(t){const e=L(t);return it((async()=>e))},t.generator=function(t){return it((async()=>{const e=await t();return L((()=>e.next()))}))},t.microphone=async function(t){return pt.create(t)},t.version_data="4.6.0",t.webcam=async function(t,e){return wt.create(t,e)},t.zip=function(t){if(!O(t))throw new Error("The argument to zip() must be an object or array.");let e;if(Array.isArray(t))for(let r=0;r<t.length;r++)e=null==e?t[r].size:Math.min(e,t[r].size);else if(t instanceof Object)for(const r in t)e=null==e?t[r].size:Math.min(e,t[r].size);return it((async()=>function(t,e=A.FAIL){return new et(t,e)}(await I(t,(t=>{if(t instanceof nt)return{value:t.iterator(),recurse:!1};if(O(t))return{value:null,recurse:!0};throw new Error("Leaves of the structure passed to zip() must be Datasets, not primitives.")})),A.SHORTEST)),e)}}));
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dist/tf-data.fesm.min.js

@@ -17,3 +17,3 @@ /**
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Z{constructor(t,e=M.FAIL){super(),this.iterators=t,this.mismatchMode=e,this.count=0,this.currentPromise=null}summary(){return"{TODO: fill in upstream of zip summaries} -> Zip"}async nextState(t){await t;let e=0,r=0;const s=await L(this.iterators,(function(t){if(t instanceof Z){return{value:t.next().then((t=>(e++,t.done&&r++,t.value))),recurse:!1}}return{value:null,recurse:!0}}));if(e===r)return{value:null,done:!0};if(r>0)switch(this.mismatchMode){case M.FAIL:throw new Error(`Zipped streams should have the same length. Mismatched at element ${this.count}.`);case M.SHORTEST:return{value:null,done:!0};case M.LONGEST:}return this.count++,{value:s,done:!1}}async next(){return this.currentPromise=this.nextState(this.currentPromise),this.currentPromise}}class ct extends Z{constructor(t,e){super(),this.upstream=t,this.bufferSize=e,this.buffer=new U(e)}summary(){return`${this.upstream.summary()} -> Prefetch`}refill(){for(;!this.buffer.isFull();){const t=this.upstream.next();this.buffer.push(t)}}next(){return this.refill(),this.buffer.shift()}}class ft extends ct{constructor(e,r,s){super(e,r),this.upstream=e,this.windowSize=r,this.upstreamExhausted=!1,this.random=j.alea(s||t.util.now().toString()),this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}randomInt(t){return Math.floor(this.random()*t)}chooseIndex(){return this.randomInt(this.buffer.length())}async serialNext(){for(this.upstreamExhausted||this.refill();!this.buffer.isEmpty();){const t=this.chooseIndex(),e=await this.buffer.shuffleExcise(t);if(!e.done)return this.refill(),e;this.upstreamExhausted=!0}return{value:null,done:!0}}}class mt{constructor(){this.size=null}batch(e,r=!0){const s=this;let n;return t.util.assert(e>0,(()=>`batchSize needs to be positive, but it is\n      ${e}`)),n=this.size===1/0||null==this.size?this.size:r?Math.ceil(this.size/e):Math.floor(this.size/e),dt((async()=>(await s.iterator()).columnMajorBatch(e,r,yt)),n)}concatenate(t){const e=this;let r;return r=this.size===1/0||t.size===1/0?1/0:null!=this.size&&null!=t.size?this.size+t.size:null,dt((async()=>(await e.iterator()).concatenate(await t.iterator())),r)}filter(e){const r=this;let s;return s=this.size===1/0?1/0:null,dt((async()=>(await r.iterator()).filter((r=>t.tidy((()=>e(r)))))),s)}async forEachAsync(t){return(await this.iterator()).forEachAsync(t)}map(e){const r=this;return dt((async()=>(await r.iterator()).map((r=>t.tidy((()=>e(r)))))),this.size)}mapAsync(t){const e=this;return dt((async()=>(await e.iterator()).mapAsync(t)),this.size)}prefetch(t){if(null==t)throw new RangeError("`Dataset.prefetch()` requires bufferSize to be specified.");const e=this;return dt((async()=>(await e.iterator()).prefetch(t)),this.size)}repeat(t){const e=this;let r;return r=null!=this.size&&t>0?this.size*t:0===t?0:null!=this.size&&(void 0===t||t<0)?1/0:null,dt((async()=>{const r=G((async()=>({value:await e.iterator(),done:!1})));return s=r.take(t),new ht(s,n);var s,n}),r)}skip(t){const e=this;let r;return r=null!=this.size&&t>=0&&this.size>=t?this.size-t:null!=this.size&&(this.size<t||void 0===t||t<0)?0:null,dt((async()=>(await e.iterator()).skip(t)),r)}shuffle(e,r,s=!0){if(null==e||e<0)throw null==this.size?new RangeError("`Dataset.shuffle()` requires bufferSize to be specified."):new RangeError(`\`Dataset.shuffle()\` requires bufferSize to be specified.  If your data fits in main memory (for regular JS objects), and/or GPU memory (for \`tf.Tensor\`s), consider setting bufferSize to the dataset size (${this.size} elements)`);const n=this,i=j.alea(r||t.util.now().toString());return dt((async()=>{let t=i.int32();return s&&(t+=i.int32()),(await n.iterator()).shuffle(e,t.toString())}),this.size)}take(t){const e=this;let r;return r=null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null,dt((async()=>(await e.iterator()).take(t)),r)}async toArray(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArray()}async toArrayForTest(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArrayForTest()}}function dt(t,e=null){return new class extends mt{constructor(){super(...arguments),this.size=e}async iterator(){return t()}}}function pt(t){return dt((async()=>X(t)),t.length)}function wt(t){if(!P(t))throw new Error("The argument to zip() must be an object or array.");let e;if(Array.isArray(t))for(let r=0;r<t.length;r++)e=null==e?t[r].size:Math.min(e,t[r].size);else if(t instanceof Object)for(const r in t)e=null==e?t[r].size:Math.min(e,t[r].size);return dt((async()=>function(t,e=M.FAIL){return new lt(t,e)}(await L(t,(t=>{if(t instanceof mt)return{value:t.iterator(),recurse:!1};if(P(t))return{value:null,recurse:!0};throw new Error("Leaves of the structure passed to zip() must be Datasets, not primitives.")})),M.SHORTEST)),e)}function yt(e){if(null===e)return null;const r=e[0];if(null==(s=r)||null===(n=s)||"object"!=typeof n&&"function"!=typeof n||Array.isArray(s)||"object"==typeof s&&s instanceof t.Tensor||t.util.isTypedArray(s)){return{value:function(e){if(0===e.length)throw new Error("Can't make a batch of zero elements.");return e[0]instanceof t.Tensor?t.stack(e):t.tensor(e)}(e),recurse:!1}}var s,n;return{value:null,recurse:!0}}mt.MAX_BUFFER_SIZE=1e4;class gt extends mt{constructor(t){super(),this.input=t}async iterator(){return(await this.input.iterator()).decodeUTF8().split("\n").map((t=>(t.endsWith("\r")&&(t=t.slice(0,-1)),t)))}}const xt=Symbol("out"),vt=Symbol("field"),bt=Symbol("quote"),Ct=Symbol("quoteafterquote"),zt=Symbol("quoteinquote");class Et extends mt{async columnNames(){return this.columnNamesValidated||await this.setColumnNames(),this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames}async setColumnNames(){const t=await this.maybeReadHeaderLine();if(!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");this.fullColumnNames&&t&&e.assert(t.length===this.fullColumnNames.length,(()=>"The length of provided columnNames ("+this.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+").")),this.fullColumnNames||(this.fullColumnNames=t);const r=this.fullColumnNames.reduce(((t,e)=>(t[e]=t[e]+1||1,t)),{}),s=Object.keys(r).filter((t=>r[t]>1));if(e.assert(0===s.length,(()=>"Duplicate column names found: "+s.toString())),this.columnConfigs)for(const t of Object.keys(this.columnConfigs)){if(-1===this.fullColumnNames.indexOf(t))throw new Error('The key "'+t+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}this.columnNamesValidated=!0}async maybeReadHeaderLine(){if(this.hasHeader){const t=await this.base.iterator(),e=await t.next();if(e.done)throw new Error("No data was found for CSV parsing.");const r=e.value;return this.parseRow(r,!1)}return null}constructor(t,r){super(),this.input=t,this.hasHeader=!0,this.fullColumnNames=null,this.columnNamesValidated=!1,this.columnConfigs=null,this.configuredColumnsOnly=!1,this.delimiter=",",this.delimWhitespace=!1,this.base=new gt(t),r||(r={}),this.hasHeader=!1!==r.hasHeader,this.fullColumnNames=r.columnNames,this.columnConfigs=r.columnConfigs,this.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.assert(null==r.delimiter,(()=>"Delimiter should not be provided when delimWhitespace is true.")),this.delimWhitespace=!0,this.delimiter=" "):this.delimiter=r.delimiter?r.delimiter:","}async iterator(){this.columnNamesValidated||await this.setColumnNames();let t=await this.base.iterator();return this.hasHeader&&(t=t.skip(1)),t.map((t=>this.makeDataElement(t)))}makeDataElement(t){const e=this.parseRow(t),r={},s={};for(let n=0;n<this.fullColumnNames.length;n++){const i=this.fullColumnNames[n],a=this.columnConfigs?this.columnConfigs[i]:null;if(!this.configuredColumnsOnly||a){const o=e[n];let u=null;if(""===o)if(a&&void 0!==a.default)u=a.default;else{if(a&&(a.required||a.isLabel))throw new Error(`Required column ${i} is empty in this line: ${t}`);u=void 0}else{const t=Number(o);if(isNaN(t))u=a&&"bool"===a.dtype?this.getBoolean(o):o;else if(a&&a.dtype)switch(a.dtype){case"float32":default:u=t;break;case"int32":u=Math.floor(t);break;case"bool":u=this.getBoolean(o)}else u=t}a&&a.isLabel?s[i]=u:r[i]=u}}return 0===Object.keys(s).length?r:{xs:r,ys:s}}getBoolean(t){return"1"===t||"true"===t.toLowerCase()?1:0}parseRow(t,e=!0){const r=[];let s=0;const n=t.length;let i=xt;for(let e=0;e<n;e++)switch(i){case xt:switch(t.charAt(e)){case'"':s=e+1,i=bt;break;case this.delimiter:if(s=e+1," "===this.delimiter&&this.delimWhitespace)break;r.push(""),i=xt;break;default:i=vt,s=e}break;case vt:if(t.charAt(e)===this.delimiter)r.push(t.substring(s,e)),i=xt,s=e+1;break;case bt:if('"'===t.charAt(e))i=Ct;break;case Ct:switch(t.charAt(e)){case this.delimiter:r.push(t.substring(s,e-1)),i=xt,s=e+1;break;case'"':i=bt;break;default:i=zt}break;case zt:if('"'===t.charAt(e))i=bt}if(i===Ct?r.push(t.substring(s,n-1)):r.push(t.substring(s)),e&&r.length!==this.fullColumnNames.length)throw new Error(`Invalid row in csv file. Should have ${this.fullColumnNames.length} elements in a row, but got ${r}`);return r}}class St extends Z{constructor(t){super(),this.microphoneConfig=t,this.isClosed=!1,this.fftSize=t.fftSize||1024;const e=Math.log2(this.fftSize);if(this.fftSize<0||e<4||e>14||!Number.isInteger(e))throw new Error(`Invalid fftSize: it must be a power of 2 between 2 to 4 and 2 to 14, but got ${this.fftSize}`);if(this.numFrames=t.numFramesPerSpectrogram||43,this.sampleRateHz=t.sampleRateHz,this.columnTruncateLength=t.columnTruncateLength||this.fftSize,this.audioTrackConstraints=t.audioTrackConstraints,this.smoothingTimeConstant=t.smoothingTimeConstant||0,this.includeSpectrogram=!1!==t.includeSpectrogram,this.includeWaveform=!0===t.includeWaveform,!this.includeSpectrogram&&!this.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.")}summary(){return"microphone"}static async create(t={}){if(!r().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");const e=new St(t);return await e.start(),e}async start(){try{this.stream=await navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})}catch(t){throw new Error(`Error thrown while initializing video stream: ${t.message}`)}if(!this.stream)throw new Error("Could not obtain audio from microphone.");const t=window.AudioContext||window.webkitAudioContext;if(this.audioContext=new t,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error(`Mismatch in sampling rate: Expected: ${this.sampleRateHz}; Actual: ${this.audioContext.sampleRate}`)}else this.sampleRateHz=this.audioContext.sampleRate;const e=this.audioContext.createMediaStreamSource(this.stream);this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,e.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize)}async next(){if(this.isClosed)return{value:null,done:!0};let t,e;const r=await this.getAudioData();if(this.includeSpectrogram){const e=this.flattenQueue(r.freqDataQueue);t=this.getTensorFromAudioDataArray(e,[this.numFrames,this.columnTruncateLength,1])}if(this.includeWaveform){const t=this.flattenQueue(r.timeDataQueue);e=this.getTensorFromAudioDataArray(t,[this.numFrames*this.fftSize,1])}return{value:{spectrogram:t,waveform:e},done:!1}}async capture(){return(await this.next()).value}async getAudioData(){const t=[],e=[];let r=0;return new Promise((s=>{const n=setInterval((()=>{this.includeSpectrogram&&(this.analyser.getFloatFrequencyData(this.freqData),this.freqData[0]===-1/0&&s({freqDataQueue:t,timeDataQueue:e}),t.push(this.freqData.slice(0,this.columnTruncateLength))),this.includeWaveform&&(this.analyser.getFloatTimeDomainData(this.timeData),e.push(this.timeData.slice())),++r===this.numFrames&&(clearInterval(n),s({freqDataQueue:t,timeDataQueue:e}))}),this.fftSize/this.sampleRateHz*1e3)}))}stop(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())}toArray(){throw new Error("Can not convert infinite audio stream to array.")}getSampleRate(){return this.sampleRateHz}flattenQueue(t){const e=t[0].length,r=new Float32Array(t.length*e);return t.forEach(((t,s)=>r.set(t,s*e))),r}getTensorFromAudioDataArray(t,r){const n=new Float32Array(e.sizeFromShape(r));return n.set(t,n.length-t.length),s(n,r)}}class At extends Z{constructor(t,e){if(super(),this.webcamVideoElement=t,this.webcamConfig=e,this.isClosed=!0,this.resize=!1,this.needToResize())if(this.resize=!0,this.cropSize=[this.webcamConfig.resizeHeight,this.webcamConfig.resizeWidth],this.cropBoxInd=n([0],"int32"),this.webcamConfig.centerCrop){const t=1*this.webcamConfig.resizeWidth/this.webcamVideoElement.width,e=1*this.webcamConfig.resizeHeight/this.webcamVideoElement.height,r=(1-t)/2,s=(1-e)/2,n=r+t,a=e+s;this.cropBox=i([s,r,a,n],[1,4])}else this.cropBox=i([0,0,1,1],[1,4])}summary(){return"webcam"}static async create(t,e={}){if(!r().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!e.resizeWidth||!e.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=e.resizeWidth,t.height=e.resizeHeight}const s=new At(t,e);return await s.start(),s}async start(){this.webcamConfig.facingMode&&e.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(()=>`Invalid webcam facing mode: ${this.webcamConfig.facingMode}. Please provide 'user' or 'environment'`));try{this.stream=await navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})}catch(t){throw t.message=`Error thrown while initializing video stream: ${t.message}`,t}if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,new Promise((t=>{this.webcamVideoElement.onloadedmetadata=()=>{t()}}))}async next(){if(this.isClosed)return{value:null,done:!0};let t;try{t=a.fromPixels(this.webcamVideoElement)}catch(t){throw new Error(`Error thrown converting video to pixels: ${JSON.stringify(t)}`)}if(!this.resize)return{value:t,done:!1};try{return{value:this.cropAndResizeFrame(t),done:!1}}catch(t){throw new Error(`Error thrown cropping the video: ${t.message}`)}finally{t.dispose()}}needToResize(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)}cropAndResizeFrame(t){return o((()=>{const e=u(h(t,"float32"),0);let r;r=l.cropAndResize(e,this.cropBox,this.cropBoxInd,this.cropSize,"bilinear");const s=r.shape;return c(r,s.slice(1))}))}async capture(){return(await this.next()).value}stop(){this.stream.getTracks().forEach((t=>t.stop()));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0}toArray(){throw new Error("Can not convert infinite video stream to array.")}}class Rt{}class Tt extends Z{split(t){return new Ft(this,t)}}class Ft extends Tt{constructor(t,e){super(),this.upstream=t,this.impl=new kt(t,e)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class kt extends ot{constructor(t,e){super(),this.upstream=t,this.separator=e,this.carryover=""}summary(){return`${this.upstream.summary()} -> Split('${this.separator}')`}async pump(){const t=await this.upstream.next();if(t.done)return""!==this.carryover&&(this.outputQueue.push(this.carryover),this.carryover="",!0);const e=t.value.split(this.separator);e[0]=this.carryover+e[0];for(const t of e.slice(0,-1))this.outputQueue.push(t);return this.carryover=e[e.length-1],!0}}class Nt extends Z{decodeUTF8(){return new It(this)}}class It extends Tt{constructor(t){super(),this.upstream=t,this.impl=new _t(t)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class _t extends ot{constructor(t){if(super(),this.upstream=t,r().get("IS_BROWSER"))this.decoder=new TextDecoder("utf-8");else{const{StringDecoder:t}=require("string_decoder");this.decoder=new t("utf8")}}summary(){return`${this.upstream.summary()} -> Utf8`}async pump(){const t=await this.upstream.next();let e,s;return!t.done&&(e=t.value,s=r().get("IS_BROWSER")?this.decoder.decode(e,{stream:!0}):this.decoder.write(Buffer.from(e.buffer)),this.outputQueue.push(s),!0)}}class Dt extends Nt{constructor(t,s={}){super(),this.file=t,this.options=s,e.assert(t instanceof Uint8Array||!!r().get("IS_BROWSER")&&(t instanceof File||t instanceof Blob),(()=>"FileChunkIterator only supports File, Blob and Uint8Array right now.")),this.offset=s.offset||0,this.chunkSize=s.chunkSize||1048576}summary(){return`FileChunks ${this.file}`}async next(){if(this.offset>=(this.file instanceof Uint8Array?this.file.byteLength:this.file.size))return{value:null,done:!0};const t=new Promise(((t,e)=>{const r=this.offset+this.chunkSize;if(this.file instanceof Uint8Array)t(new Uint8Array(this.file.slice(this.offset,r)));else{const s=new FileReader;s.onload=r=>{let n=s.result;if(n instanceof ArrayBuffer&&(n=new Uint8Array(n)),!(n instanceof Uint8Array))return e(new TypeError("FileReader returned unknown type."));t(n)},s.onabort=t=>e(new Error("Aborted")),s.onerror=t=>e(new Error(t.type));const n=this.file.slice(this.offset,r);s.readAsArrayBuffer(n)}this.offset=r}));return{value:await t,done:!1}}}const Ot=t=>({method:t.method,headers:t.headers,body:t.body,mode:t.mode,credentials:t.credentials,cache:t.cache,redirect:t.redirect,referrer:t.referrer,integrity:t.integrity});function Mt(t){return"string"==typeof t&&"file://"===t.slice(0,7)}class jt extends Rt{constructor(t,e={}){super(),this.input=t,this.options=e}async iterator(){if(Mt(this.input)&&r().get("IS_NODE")){const t=require("fs");this.input=t.readFileSync(this.input.slice(7))}return new Dt(this.input,this.options)}}class Bt extends Rt{constructor(t,e={}){super(),this.url=t,this.fileOptions=e}async iterator(){return Mt(this.url)?new jt(this.url,this.fileOptions).iterator():async function(t,r={},s){let n,i;"string"==typeof t?n=t:(n=t.url,i=Ot(t));const a=await(s||e.fetch)(n,i);if(a.ok){const t=new Uint8Array(await a.arrayBuffer());return new Dt(t,r)}throw new Error(a.statusText)}(this.url,this.fileOptions)}}function $t(t,e={}){return new Et(new Bt(t),e)}function Ht(t){const e=G(t);return dt((async()=>e))}function qt(t){return dt((async()=>{const e=await t();return G((()=>e.next()))}))}async function Lt(t,e){return At.create(t,e)}async function Pt(t){return St.create(t)}const Wt="4.5.0";export{Et as CSVDataset,mt as Dataset,jt as FileDataSource,gt as TextLineDataset,Bt as URLDataSource,pt as array,$t as csv,Ht as func,qt as generator,Pt as microphone,Wt as version_data,Lt as webcam,wt as zip};
+import*as t from"@tensorflow/tfjs-core";import{util as e,env as r,tensor as s,tensor1d as n,tensor2d as i,browser as a,tidy as o,expandDims as u,cast as h,image as l,reshape as c}from"@tensorflow/tfjs-core";var f="undefined"!=typeof globalThis?globalThis:"undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:{};function m(t){if(t.__esModule)return t;var e=t.default;if("function"==typeof e){var r=function t(){if(this instanceof t){var r=[null];r.push.apply(r,arguments);var s=Function.bind.apply(e,r);return new s}return e.apply(this,arguments)};r.prototype=e.prototype}else r={};return Object.defineProperty(r,"__esModule",{value:!0}),Object.keys(t).forEach((function(e){var s=Object.getOwnPropertyDescriptor(t,e);Object.defineProperty(r,e,s.get?s:{enumerable:!0,get:function(){return t[e]}})})),r}var d={exports:{}};!function(t,e,r){function s(t){var e,r=this,s=(e=4022871197,function(t){t=String(t);for(var r=0;r<t.length;r++){var s=.02519603282416938*(e+=t.charCodeAt(r));s-=e=s>>>0,e=(s*=e)>>>0,e+=4294967296*(s-=e)}return 2.3283064365386963e-10*(e>>>0)});r.next=function(){var t=2091639*r.s0+2.3283064365386963e-10*r.c;return r.s0=r.s1,r.s1=r.s2,r.s2=t-(r.c=0|t)},r.c=1,r.s0=s(" "),r.s1=s(" "),r.s2=s(" "),r.s0-=s(t),r.s0<0&&(r.s0+=1),r.s1-=s(t),r.s1<0&&(r.s1+=1),r.s2-=s(t),r.s2<0&&(r.s2+=1),s=null}function n(t,e){return e.c=t.c,e.s0=t.s0,e.s1=t.s1,e.s2=t.s2,e}function i(t,e){var r=new s(t),i=e&&e.state,a=r.next;return a.int32=function(){return 4294967296*r.next()|0},a.double=function(){return a()+11102230246251565e-32*(2097152*a()|0)},a.quick=a,i&&("object"==typeof i&&n(i,r),a.state=function(){return n(r,{})}),a}e&&e.exports?e.exports=i:r&&r.amd?r((function(){return i})):this.alea=i}(0,d,!1);var p=d.exports,w={exports:{}};!function(t,e,r){function s(t){var e=this,r="";e.x=0,e.y=0,e.z=0,e.w=0,e.next=function(){var t=e.x^e.x<<11;return e.x=e.y,e.y=e.z,e.z=e.w,e.w^=e.w>>>19^t^t>>>8},t===(0|t)?e.x=t:r+=t;for(var 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nt(this,t)}mapAsync(t){return new at(this,t)}serialMapAsync(t){return new at(this,t).serial()}flatmap(t){return new ut(this,t)}async forEachAsync(t){return this.map(t).resolveFully()}async serialForEach(t){return this.serialMapAsync(t).resolveWhile((t=>!0===t))}rowMajorBatch(t,e=!0){return new rt(this,t,e)}columnMajorBatch(t,e=!0,r=q){return this.rowMajorBatch(t,e).map((t=>$(t,r)))}concatenate(t,e){return new ht(X([this,t]),e)}take(t){return t<0||null==t?this:new et(this,t)}skip(t){return t<0||null==t?this:new tt(this,t)}prefetch(t){return new ct(this,t)}shuffle(t,e){return new ft(this,t,e)}serial(){return new K(this)}}class J extends Z{constructor(t){super(),this.items=t,this.trav=0}summary(){return`Array of ${this.items.length} items`}async next(){if(this.trav>=this.items.length)return{value:null,done:!0};const t=this.items[this.trav];return this.trav++,{value:W(t),done:!1}}}class Y extends Z{constructor(t){super(),this.nextFn=t}summary(){return"Function call"}async next(){try{return 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this.upstream.next();if(e.done||this.predicate(e.value))return e;t.dispose(e.value)}}}class nt extends Z{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Map`}async next(){const e=await this.upstream.next();if(e.done)return{value:null,done:!0};const r=t.tensor_util.getTensorsInContainer(e.value),s=this.transform(e.value),n=t.tensor_util.getTensorsInContainer(s);for(const e of r)t.tensor_util.isTensorInList(e,n)||e.dispose();return{value:s,done:!1}}}class it extends Z{constructor(t,e){super(),this.upstream=t,this.handler=e,this.count=0,this.lastRead=Promise.resolve({value:null,done:!1})}summary(){return`${this.upstream.summary()} -> handleErrors`}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;;)try{return await this.upstream.next()}catch(t){if(!this.handler(t))return{value:null,done:!0}}}}class at extends Z{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> AsyncMap`}async next(){const e=await this.upstream.next();if(e.done)return{value:null,done:!0};const r=t.tensor_util.getTensorsInContainer(e.value),s=await this.transform(e.value),n=t.tensor_util.getTensorsInContainer(s);for(const e of r)t.tensor_util.isTensorInList(e,n)||e.dispose();return{value:s,done:!1}}}class ot extends Z{constructor(){super(),this.outputQueue=new Q,this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}async serialNext(){for(;0===this.outputQueue.length();)if(!await this.pump())return{value:null,done:!0};return{value:this.outputQueue.shift(),done:!1}}}class ut extends ot{constructor(t,e){super(),this.upstream=t,this.transform=e}summary(){return`${this.upstream.summary()} -> Flatmap`}async pump(){const e=await this.upstream.next();if(e.done)return!1;const r=t.tensor_util.getTensorsInContainer(e.value),s=this.transform(e.value),n=t.tensor_util.getTensorsInContainer(s);this.outputQueue.pushAll(s);for(const e of r)t.tensor_util.isTensorInList(e,n)||e.dispose();return!0}}class ht extends Z{constructor(t,e){super(),this.baseErrorHandler=e,this.lastRead=null,this.iterator=null,this.moreIterators=t}summary(){return"TODO: fill in upstream of chained summaries -> Chained"}async next(){return this.lastRead=this.readFromChain(this.lastRead),this.lastRead}async readFromChain(t){if(await t,null==this.iterator){const t=await this.moreIterators.next();if(t.done)return{value:null,done:!0};this.iterator=t.value,null!=this.baseErrorHandler&&(this.iterator=this.iterator.handleErrors(this.baseErrorHandler))}const e=await this.iterator.next();return e.done?(this.iterator=null,this.readFromChain(t)):e}}!function(t){t[t.FAIL=0]="FAIL",t[t.SHORTEST=1]="SHORTEST",t[t.LONGEST=2]="LONGEST"}(M||(M={}));class lt extends Z{constructor(t,e=M.FAIL){super(),this.iterators=t,this.mismatchMode=e,this.count=0,this.currentPromise=null}summary(){return"{TODO: fill in upstream of zip summaries} -> Zip"}async nextState(t){await t;let e=0,r=0;const s=await L(this.iterators,(function(t){if(t instanceof Z){return{value:t.next().then((t=>(e++,t.done&&r++,t.value))),recurse:!1}}return{value:null,recurse:!0}}));if(e===r)return{value:null,done:!0};if(r>0)switch(this.mismatchMode){case M.FAIL:throw new Error(`Zipped streams should have the same length. Mismatched at element ${this.count}.`);case M.SHORTEST:return{value:null,done:!0};case M.LONGEST:}return this.count++,{value:s,done:!1}}async next(){return this.currentPromise=this.nextState(this.currentPromise),this.currentPromise}}class ct extends Z{constructor(t,e){super(),this.upstream=t,this.bufferSize=e,this.buffer=new U(e)}summary(){return`${this.upstream.summary()} -> Prefetch`}refill(){for(;!this.buffer.isFull();){const t=this.upstream.next();this.buffer.push(t)}}next(){return this.refill(),this.buffer.shift()}}class ft extends ct{constructor(e,r,s){super(e,r),this.upstream=e,this.windowSize=r,this.upstreamExhausted=!1,this.random=j.alea(s||t.util.now().toString()),this.lastRead=Promise.resolve({value:null,done:!1})}async next(){return this.lastRead=this.lastRead.then((()=>this.serialNext())),this.lastRead}randomInt(t){return Math.floor(this.random()*t)}chooseIndex(){return this.randomInt(this.buffer.length())}async serialNext(){for(this.upstreamExhausted||this.refill();!this.buffer.isEmpty();){const t=this.chooseIndex(),e=await this.buffer.shuffleExcise(t);if(!e.done)return this.refill(),e;this.upstreamExhausted=!0}return{value:null,done:!0}}}class mt{constructor(){this.size=null}batch(e,r=!0){const s=this;let n;return t.util.assert(e>0,(()=>`batchSize needs to be positive, but it is\n      ${e}`)),n=this.size===1/0||null==this.size?this.size:r?Math.ceil(this.size/e):Math.floor(this.size/e),dt((async()=>(await s.iterator()).columnMajorBatch(e,r,yt)),n)}concatenate(t){const e=this;let r;return r=this.size===1/0||t.size===1/0?1/0:null!=this.size&&null!=t.size?this.size+t.size:null,dt((async()=>(await e.iterator()).concatenate(await t.iterator())),r)}filter(e){const r=this;let s;return s=this.size===1/0?1/0:null,dt((async()=>(await r.iterator()).filter((r=>t.tidy((()=>e(r)))))),s)}async forEachAsync(t){return(await this.iterator()).forEachAsync(t)}map(e){const r=this;return dt((async()=>(await r.iterator()).map((r=>t.tidy((()=>e(r)))))),this.size)}mapAsync(t){const e=this;return dt((async()=>(await e.iterator()).mapAsync(t)),this.size)}prefetch(t){if(null==t)throw new RangeError("`Dataset.prefetch()` requires bufferSize to be specified.");const e=this;return dt((async()=>(await e.iterator()).prefetch(t)),this.size)}repeat(t){const e=this;let r;return r=null!=this.size&&t>0?this.size*t:0===t?0:null!=this.size&&(void 0===t||t<0)?1/0:null,dt((async()=>{const r=G((async()=>({value:await e.iterator(),done:!1})));return s=r.take(t),new ht(s,n);var s,n}),r)}skip(t){const e=this;let r;return r=null!=this.size&&t>=0&&this.size>=t?this.size-t:null!=this.size&&(this.size<t||void 0===t||t<0)?0:null,dt((async()=>(await e.iterator()).skip(t)),r)}shuffle(e,r,s=!0){if(null==e||e<0)throw null==this.size?new RangeError("`Dataset.shuffle()` requires bufferSize to be specified."):new RangeError(`\`Dataset.shuffle()\` requires bufferSize to be specified.  If your data fits in main memory (for regular JS objects), and/or GPU memory (for \`tf.Tensor\`s), consider setting bufferSize to the dataset size (${this.size} elements)`);const n=this,i=j.alea(r||t.util.now().toString());return dt((async()=>{let t=i.int32();return s&&(t+=i.int32()),(await n.iterator()).shuffle(e,t.toString())}),this.size)}take(t){const e=this;let r;return r=null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null,dt((async()=>(await e.iterator()).take(t)),r)}async toArray(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArray()}async toArrayForTest(){if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return(await this.iterator()).toArrayForTest()}}function dt(t,e=null){return new class extends mt{constructor(){super(...arguments),this.size=e}async iterator(){return t()}}}function pt(t){return dt((async()=>X(t)),t.length)}function wt(t){if(!P(t))throw new Error("The argument to zip() must be an object or array.");let e;if(Array.isArray(t))for(let r=0;r<t.length;r++)e=null==e?t[r].size:Math.min(e,t[r].size);else if(t instanceof Object)for(const r in t)e=null==e?t[r].size:Math.min(e,t[r].size);return dt((async()=>function(t,e=M.FAIL){return new lt(t,e)}(await L(t,(t=>{if(t instanceof mt)return{value:t.iterator(),recurse:!1};if(P(t))return{value:null,recurse:!0};throw new Error("Leaves of the structure passed to zip() must be Datasets, not primitives.")})),M.SHORTEST)),e)}function yt(e){if(null===e)return null;const r=e[0];if(null==(s=r)||null===(n=s)||"object"!=typeof n&&"function"!=typeof n||Array.isArray(s)||"object"==typeof s&&s instanceof t.Tensor||t.util.isTypedArray(s)){return{value:function(e){if(0===e.length)throw new Error("Can't make a batch of zero elements.");return e[0]instanceof t.Tensor?t.stack(e):t.tensor(e)}(e),recurse:!1}}var s,n;return{value:null,recurse:!0}}mt.MAX_BUFFER_SIZE=1e4;class gt extends mt{constructor(t){super(),this.input=t}async iterator(){return(await this.input.iterator()).decodeUTF8().split("\n").map((t=>(t.endsWith("\r")&&(t=t.slice(0,-1)),t)))}}const xt=Symbol("out"),vt=Symbol("field"),bt=Symbol("quote"),Ct=Symbol("quoteafterquote"),zt=Symbol("quoteinquote");class Et extends mt{async columnNames(){return this.columnNamesValidated||await this.setColumnNames(),this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames}async setColumnNames(){const t=await this.maybeReadHeaderLine();if(!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");this.fullColumnNames&&t&&e.assert(t.length===this.fullColumnNames.length,(()=>"The length of provided columnNames ("+this.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+").")),this.fullColumnNames||(this.fullColumnNames=t);const r=this.fullColumnNames.reduce(((t,e)=>(t[e]=t[e]+1||1,t)),{}),s=Object.keys(r).filter((t=>r[t]>1));if(e.assert(0===s.length,(()=>"Duplicate column names found: "+s.toString())),this.columnConfigs)for(const t of Object.keys(this.columnConfigs)){if(-1===this.fullColumnNames.indexOf(t))throw new Error('The key "'+t+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}this.columnNamesValidated=!0}async maybeReadHeaderLine(){if(this.hasHeader){const t=await this.base.iterator(),e=await t.next();if(e.done)throw new Error("No data was found for CSV parsing.");const r=e.value;return this.parseRow(r,!1)}return null}constructor(t,r){super(),this.input=t,this.hasHeader=!0,this.fullColumnNames=null,this.columnNamesValidated=!1,this.columnConfigs=null,this.configuredColumnsOnly=!1,this.delimiter=",",this.delimWhitespace=!1,this.base=new gt(t),r||(r={}),this.hasHeader=!1!==r.hasHeader,this.fullColumnNames=r.columnNames,this.columnConfigs=r.columnConfigs,this.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.assert(null==r.delimiter,(()=>"Delimiter should not be provided when delimWhitespace is true.")),this.delimWhitespace=!0,this.delimiter=" "):this.delimiter=r.delimiter?r.delimiter:","}async iterator(){this.columnNamesValidated||await this.setColumnNames();let t=await this.base.iterator();return this.hasHeader&&(t=t.skip(1)),t.map((t=>this.makeDataElement(t)))}makeDataElement(t){const e=this.parseRow(t),r={},s={};for(let n=0;n<this.fullColumnNames.length;n++){const i=this.fullColumnNames[n],a=this.columnConfigs?this.columnConfigs[i]:null;if(!this.configuredColumnsOnly||a){const o=e[n];let u=null;if(""===o)if(a&&void 0!==a.default)u=a.default;else{if(a&&(a.required||a.isLabel))throw new Error(`Required column ${i} is empty in this line: ${t}`);u=void 0}else{const t=Number(o);if(isNaN(t))u=a&&"bool"===a.dtype?this.getBoolean(o):o;else if(a&&a.dtype)switch(a.dtype){case"float32":default:u=t;break;case"int32":u=Math.floor(t);break;case"bool":u=this.getBoolean(o)}else u=t}a&&a.isLabel?s[i]=u:r[i]=u}}return 0===Object.keys(s).length?r:{xs:r,ys:s}}getBoolean(t){return"1"===t||"true"===t.toLowerCase()?1:0}parseRow(t,e=!0){const r=[];let s=0;const n=t.length;let i=xt;for(let e=0;e<n;e++)switch(i){case xt:switch(t.charAt(e)){case'"':s=e+1,i=bt;break;case this.delimiter:if(s=e+1," "===this.delimiter&&this.delimWhitespace)break;r.push(""),i=xt;break;default:i=vt,s=e}break;case vt:if(t.charAt(e)===this.delimiter)r.push(t.substring(s,e)),i=xt,s=e+1;break;case bt:if('"'===t.charAt(e))i=Ct;break;case Ct:switch(t.charAt(e)){case this.delimiter:r.push(t.substring(s,e-1)),i=xt,s=e+1;break;case'"':i=bt;break;default:i=zt}break;case zt:if('"'===t.charAt(e))i=bt}if(i===Ct?r.push(t.substring(s,n-1)):r.push(t.substring(s)),e&&r.length!==this.fullColumnNames.length)throw new Error(`Invalid row in csv file. Should have ${this.fullColumnNames.length} elements in a row, but got ${r}`);return r}}class St extends Z{constructor(t){super(),this.microphoneConfig=t,this.isClosed=!1,this.fftSize=t.fftSize||1024;const e=Math.log2(this.fftSize);if(this.fftSize<0||e<4||e>14||!Number.isInteger(e))throw new Error(`Invalid fftSize: it must be a power of 2 between 2 to 4 and 2 to 14, but got ${this.fftSize}`);if(this.numFrames=t.numFramesPerSpectrogram||43,this.sampleRateHz=t.sampleRateHz,this.columnTruncateLength=t.columnTruncateLength||this.fftSize,this.audioTrackConstraints=t.audioTrackConstraints,this.smoothingTimeConstant=t.smoothingTimeConstant||0,this.includeSpectrogram=!1!==t.includeSpectrogram,this.includeWaveform=!0===t.includeWaveform,!this.includeSpectrogram&&!this.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.")}summary(){return"microphone"}static async create(t={}){if(!r().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");const e=new St(t);return await e.start(),e}async start(){try{this.stream=await navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})}catch(t){throw new Error(`Error thrown while initializing video stream: ${t.message}`)}if(!this.stream)throw new Error("Could not obtain audio from microphone.");const t=window.AudioContext||window.webkitAudioContext;if(this.audioContext=new t,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error(`Mismatch in sampling rate: Expected: ${this.sampleRateHz}; Actual: ${this.audioContext.sampleRate}`)}else this.sampleRateHz=this.audioContext.sampleRate;const e=this.audioContext.createMediaStreamSource(this.stream);this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,e.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize)}async next(){if(this.isClosed)return{value:null,done:!0};let t,e;const r=await this.getAudioData();if(this.includeSpectrogram){const e=this.flattenQueue(r.freqDataQueue);t=this.getTensorFromAudioDataArray(e,[this.numFrames,this.columnTruncateLength,1])}if(this.includeWaveform){const t=this.flattenQueue(r.timeDataQueue);e=this.getTensorFromAudioDataArray(t,[this.numFrames*this.fftSize,1])}return{value:{spectrogram:t,waveform:e},done:!1}}async capture(){return(await this.next()).value}async getAudioData(){const t=[],e=[];let r=0;return new Promise((s=>{const n=setInterval((()=>{this.includeSpectrogram&&(this.analyser.getFloatFrequencyData(this.freqData),this.freqData[0]===-1/0&&s({freqDataQueue:t,timeDataQueue:e}),t.push(this.freqData.slice(0,this.columnTruncateLength))),this.includeWaveform&&(this.analyser.getFloatTimeDomainData(this.timeData),e.push(this.timeData.slice())),++r===this.numFrames&&(clearInterval(n),s({freqDataQueue:t,timeDataQueue:e}))}),this.fftSize/this.sampleRateHz*1e3)}))}stop(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())}toArray(){throw new Error("Can not convert infinite audio stream to array.")}getSampleRate(){return this.sampleRateHz}flattenQueue(t){const e=t[0].length,r=new Float32Array(t.length*e);return t.forEach(((t,s)=>r.set(t,s*e))),r}getTensorFromAudioDataArray(t,r){const n=new Float32Array(e.sizeFromShape(r));return n.set(t,n.length-t.length),s(n,r)}}class At extends Z{constructor(t,e){if(super(),this.webcamVideoElement=t,this.webcamConfig=e,this.isClosed=!0,this.resize=!1,this.needToResize())if(this.resize=!0,this.cropSize=[this.webcamConfig.resizeHeight,this.webcamConfig.resizeWidth],this.cropBoxInd=n([0],"int32"),this.webcamConfig.centerCrop){const t=1*this.webcamConfig.resizeWidth/this.webcamVideoElement.width,e=1*this.webcamConfig.resizeHeight/this.webcamVideoElement.height,r=(1-t)/2,s=(1-e)/2,n=r+t,a=e+s;this.cropBox=i([s,r,a,n],[1,4])}else this.cropBox=i([0,0,1,1],[1,4])}summary(){return"webcam"}static async create(t,e={}){if(!r().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!e.resizeWidth||!e.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=e.resizeWidth,t.height=e.resizeHeight}const s=new At(t,e);return await s.start(),s}async start(){this.webcamConfig.facingMode&&e.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(()=>`Invalid webcam facing mode: ${this.webcamConfig.facingMode}. Please provide 'user' or 'environment'`));try{this.stream=await navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})}catch(t){throw t.message=`Error thrown while initializing video stream: ${t.message}`,t}if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,new Promise((t=>{this.webcamVideoElement.onloadedmetadata=()=>{t()}}))}async next(){if(this.isClosed)return{value:null,done:!0};let t;try{t=a.fromPixels(this.webcamVideoElement)}catch(t){throw new Error(`Error thrown converting video to pixels: ${JSON.stringify(t)}`)}if(!this.resize)return{value:t,done:!1};try{return{value:this.cropAndResizeFrame(t),done:!1}}catch(t){throw new Error(`Error thrown cropping the video: ${t.message}`)}finally{t.dispose()}}needToResize(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)}cropAndResizeFrame(t){return o((()=>{const e=u(h(t,"float32"),0);let r;r=l.cropAndResize(e,this.cropBox,this.cropBoxInd,this.cropSize,"bilinear");const s=r.shape;return c(r,s.slice(1))}))}async capture(){return(await this.next()).value}stop(){this.stream.getTracks().forEach((t=>t.stop()));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0}toArray(){throw new Error("Can not convert infinite video stream to array.")}}class Rt{}class Tt extends Z{split(t){return new Ft(this,t)}}class Ft extends Tt{constructor(t,e){super(),this.upstream=t,this.impl=new kt(t,e)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class kt extends ot{constructor(t,e){super(),this.upstream=t,this.separator=e,this.carryover=""}summary(){return`${this.upstream.summary()} -> Split('${this.separator}')`}async pump(){const t=await this.upstream.next();if(t.done)return""!==this.carryover&&(this.outputQueue.push(this.carryover),this.carryover="",!0);const e=t.value.split(this.separator);e[0]=this.carryover+e[0];for(const t of e.slice(0,-1))this.outputQueue.push(t);return this.carryover=e[e.length-1],!0}}class Nt extends Z{decodeUTF8(){return new It(this)}}class It extends Tt{constructor(t){super(),this.upstream=t,this.impl=new _t(t)}summary(){return this.impl.summary()}async next(){return this.impl.next()}}class _t extends ot{constructor(t){if(super(),this.upstream=t,r().get("IS_BROWSER"))this.decoder=new TextDecoder("utf-8");else{const{StringDecoder:t}=require("string_decoder");this.decoder=new t("utf8")}}summary(){return`${this.upstream.summary()} -> Utf8`}async pump(){const t=await this.upstream.next();let e,s;return!t.done&&(e=t.value,s=r().get("IS_BROWSER")?this.decoder.decode(e,{stream:!0}):this.decoder.write(Buffer.from(e.buffer)),this.outputQueue.push(s),!0)}}class Dt extends Nt{constructor(t,s={}){super(),this.file=t,this.options=s,e.assert(t instanceof Uint8Array||!!r().get("IS_BROWSER")&&(t instanceof File||t instanceof Blob),(()=>"FileChunkIterator only supports File, Blob and Uint8Array right now.")),this.offset=s.offset||0,this.chunkSize=s.chunkSize||1048576}summary(){return`FileChunks ${this.file}`}async next(){if(this.offset>=(this.file instanceof Uint8Array?this.file.byteLength:this.file.size))return{value:null,done:!0};const t=new Promise(((t,e)=>{const r=this.offset+this.chunkSize;if(this.file instanceof Uint8Array)t(new Uint8Array(this.file.slice(this.offset,r)));else{const s=new FileReader;s.onload=r=>{let n=s.result;if(n instanceof ArrayBuffer&&(n=new Uint8Array(n)),!(n instanceof Uint8Array))return e(new TypeError("FileReader returned unknown type."));t(n)},s.onabort=t=>e(new Error("Aborted")),s.onerror=t=>e(new Error(t.type));const n=this.file.slice(this.offset,r);s.readAsArrayBuffer(n)}this.offset=r}));return{value:await t,done:!1}}}const Ot=t=>({method:t.method,headers:t.headers,body:t.body,mode:t.mode,credentials:t.credentials,cache:t.cache,redirect:t.redirect,referrer:t.referrer,integrity:t.integrity});function Mt(t){return"string"==typeof t&&"file://"===t.slice(0,7)}class jt extends Rt{constructor(t,e={}){super(),this.input=t,this.options=e}async iterator(){if(Mt(this.input)&&r().get("IS_NODE")){const t=require("fs");this.input=t.readFileSync(this.input.slice(7))}return new Dt(this.input,this.options)}}class Bt extends Rt{constructor(t,e={}){super(),this.url=t,this.fileOptions=e}async iterator(){return Mt(this.url)?new jt(this.url,this.fileOptions).iterator():async function(t,r={},s){let n,i;"string"==typeof t?n=t:(n=t.url,i=Ot(t));const a=await(s||e.fetch)(n,i);if(a.ok){const t=new Uint8Array(await a.arrayBuffer());return new Dt(t,r)}throw new Error(a.statusText)}(this.url,this.fileOptions)}}function $t(t,e={}){return new Et(new Bt(t),e)}function Ht(t){const e=G(t);return dt((async()=>e))}function qt(t){return dt((async()=>{const e=await t();return G((()=>e.next()))}))}async function Lt(t,e){return At.create(t,e)}async function Pt(t){return St.create(t)}const Wt="4.6.0";export{Et as CSVDataset,mt as Dataset,jt as FileDataSource,gt as TextLineDataset,Bt as URLDataSource,pt as array,$t as csv,Ht as func,qt as generator,Pt as microphone,Wt as version_data,Lt as webcam,wt as zip};
 //# sourceMappingURL=tf-data.fesm.min.js.map

dist/tf-data.min.js

@@ -17,3 +17,3 @@ /**
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If your data fits in main memory (for regular JS objects), and/or GPU memory (for `tf.Tensor`s), consider setting "+"bufferSize to the dataset size (".concat(this.size," elements)"));var o=this,a=D.alea(e||r.util.now().toString());return ht((function(){return u(i,void 0,void 0,(function(){var e;return s(this,(function(r){switch(r.label){case 0:return e=a.int32(),n&&(e+=a.int32()),[4,o.iterator()];case 1:return[2,r.sent().shuffle(t,e.toString())]}}))}))}),this.size)},t.prototype.take=function(t){var e=this,n=this;return ht((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().take(t)]}}))}))}),null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null)},t.prototype.toArray=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:if(this.size===1/0)throw new Error("Can not convert infinite data stream to 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r.Tensor?r.stack(t):r.tensor(t)}(t),recurse:!1}:{value:null,recurse:!0}}ft.MAX_BUFFER_SIZE=1e4;var dt=function(t){function e(e){var n=t.call(this)||this;return n.input=e,n}return o(e,t),e.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:return[4,this.input.iterator()];case 1:return t=n.sent(),e=t.decodeUTF8(),[2,e.split("\n").map((function(t){return t.endsWith("\r")&&(t=t.slice(0,-1)),t}))]}}))}))},e}(ft),vt='"',mt=Symbol("out"),yt=Symbol("field"),wt=Symbol("quote"),bt=Symbol("quoteafterquote"),gt=Symbol("quoteinquote"),xt=function(t){function n(n,r){var i=t.call(this)||this;return i.input=n,i.hasHeader=!0,i.fullColumnNames=null,i.columnNamesValidated=!1,i.columnConfigs=null,i.configuredColumnsOnly=!1,i.delimiter=",",i.delimWhitespace=!1,i.base=new dt(n),r||(r={}),i.hasHeader=!1!==r.hasHeader,i.fullColumnNames=r.columnNames,i.columnConfigs=r.columnConfigs,i.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.util.assert(null==r.delimiter,(function(){return"Delimiter should not be provided when delimWhitespace is true."})),i.delimWhitespace=!0,i.delimiter=" "):i.delimiter=r.delimiter?r.delimiter:",",i}return o(n,t),n.prototype.columnNames=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return this.columnNamesValidated?[3,2]:[4,this.setColumnNames()];case 1:t.sent(),t.label=2;case 2:return[2,this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames]}}))}))},n.prototype.setColumnNames=function(){return u(this,void 0,void 0,(function(){var t,n,r,i,o,u,c,l,f=this;return s(this,(function(s){switch(s.label){case 0:return[4,this.maybeReadHeaderLine()];case 1:if(t=s.sent(),!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");if(this.fullColumnNames&&t&&e.util.assert(t.length===this.fullColumnNames.length,(function(){return"The length of provided columnNames ("+f.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+")."})),this.fullColumnNames||(this.fullColumnNames=t),n=this.fullColumnNames.reduce((function(t,e){return t[e]=t[e]+1||1,t}),{}),r=Object.keys(n).filter((function(t){return n[t]>1})),e.util.assert(0===r.length,(function(){return"Duplicate column names found: "+r.toString()})),this.columnConfigs)try{for(i=a(Object.keys(this.columnConfigs)),o=i.next();!o.done;o=i.next())if(u=o.value,-1===this.fullColumnNames.indexOf(u))throw new Error('The key "'+u+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}catch(t){c={error:t}}finally{try{o&&!o.done&&(l=i.return)&&l.call(i)}finally{if(c)throw c.error}}return this.columnNamesValidated=!0,[2]}}))}))},n.prototype.maybeReadHeaderLine=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:return this.hasHeader?[4,this.base.iterator()]:[3,3];case 1:return[4,n.sent().next()];case 2:if((t=n.sent()).done)throw new Error("No data was found for CSV parsing.");return e=t.value,[2,this.parseRow(e,!1)];case 3:return[2,null]}}))}))},n.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t,e=this;return s(this,(function(n){switch(n.label){case 0:return this.columnNamesValidated?[3,2]:[4,this.setColumnNames()];case 1:n.sent(),n.label=2;case 2:return[4,this.base.iterator()];case 3:return t=n.sent(),this.hasHeader&&(t=t.skip(1)),[2,t.map((function(t){return e.makeDataElement(t)}))]}}))}))},n.prototype.makeDataElement=function(t){for(var e=this.parseRow(t),n={},r={},i=0;i<this.fullColumnNames.length;i++){var o=this.fullColumnNames[i],u=this.columnConfigs?this.columnConfigs[o]:null;if(!this.configuredColumnsOnly||u){var s=e[i],a=null;if(""===s)if(u&&void 0!==u.default)a=u.default;else{if(u&&(u.required||u.isLabel))throw new Error("Required column ".concat(o," is empty in this line: ").concat(t));a=void 0}else{var c=Number(s);if(isNaN(c))a=u&&"bool"===u.dtype?this.getBoolean(s):s;else if(u&&u.dtype)switch(u.dtype){case"float32":default:a=c;break;case"int32":a=Math.floor(c);break;case"bool":a=this.getBoolean(s)}else a=c}u&&u.isLabel?r[o]=a:n[o]=a}}return 0===Object.keys(r).length?n:{xs:n,ys:r}},n.prototype.getBoolean=function(t){return"1"===t||"true"===t.toLowerCase()?1:0},n.prototype.parseRow=function(t,e){void 0===e&&(e=!0);for(var n=[],r=0,i=t.length,o=mt,u=0;u<i;u++)switch(o){case mt:switch(t.charAt(u)){case vt:r=u+1,o=wt;break;case this.delimiter:if(r=u+1," "===this.delimiter&&this.delimWhitespace)break;n.push(""),o=mt;break;default:o=yt,r=u}break;case yt:if(t.charAt(u)===this.delimiter)n.push(t.substring(r,u)),o=mt,r=u+1;break;case wt:if(t.charAt(u)===vt)o=bt;break;case bt:switch(t.charAt(u)){case this.delimiter:n.push(t.substring(r,u-1)),o=mt,r=u+1;break;case vt:o=wt;break;default:o=gt}break;case gt:if(t.charAt(u)===vt)o=wt}if(o===bt?n.push(t.substring(r,i-1)):n.push(t.substring(r)),e&&n.length!==this.fullColumnNames.length)throw new Error("Invalid row in csv file. Should have ".concat(this.fullColumnNames.length," elements in a row, but got ").concat(n));return n},n}(ft),Ct=function(t){function n(e){var n=t.call(this)||this;n.microphoneConfig=e,n.isClosed=!1,n.fftSize=e.fftSize||1024;var r=Math.log2(n.fftSize);if(n.fftSize<0||r<4||r>14||!Number.isInteger(r))throw new Error("Invalid fftSize: it must be a power of 2 between "+"2 to 4 and 2 to 14, but got ".concat(n.fftSize));if(n.numFrames=e.numFramesPerSpectrogram||43,n.sampleRateHz=e.sampleRateHz,n.columnTruncateLength=e.columnTruncateLength||n.fftSize,n.audioTrackConstraints=e.audioTrackConstraints,n.smoothingTimeConstant=e.smoothingTimeConstant||0,n.includeSpectrogram=!1!==e.includeSpectrogram,n.includeWaveform=!0===e.includeWaveform,!n.includeSpectrogram&&!n.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.");return n}return o(n,t),n.prototype.summary=function(){return"microphone"},n.create=function(t){return void 0===t&&(t={}),u(this,void 0,void 0,(function(){var r;return s(this,(function(i){switch(i.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");return[4,(r=new n(t)).start()];case 1:return i.sent(),[2,r]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,e,n,r;return s(this,(function(i){switch(i.label){case 0:return i.trys.push([0,2,,3]),t=this,[4,navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})];case 1:return t.stream=i.sent(),[3,3];case 2:throw e=i.sent(),new Error("Error thrown while initializing video stream: ".concat(e.message));case 3:if(!this.stream)throw new Error("Could not obtain audio from microphone.");if(n=window.AudioContext||window.webkitAudioContext,this.audioContext=new n,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error("Mismatch in sampling rate: "+"Expected: ".concat(this.sampleRateHz,"; ")+"Actual: ".concat(this.audioContext.sampleRate))}else this.sampleRateHz=this.audioContext.sampleRate;return r=this.audioContext.createMediaStreamSource(this.stream),this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,r.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize),[2]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i;return s(this,(function(o){switch(o.label){case 0:return this.isClosed?[2,{value:null,done:!0}]:[4,this.getAudioData()];case 1:return n=o.sent(),this.includeSpectrogram&&(r=this.flattenQueue(n.freqDataQueue),t=this.getTensorFromAudioDataArray(r,[this.numFrames,this.columnTruncateLength,1])),this.includeWaveform&&(i=this.flattenQueue(n.timeDataQueue),e=this.getTensorFromAudioDataArray(i,[this.numFrames*this.fftSize,1])),[2,{value:{spectrogram:t,waveform:e},done:!1}]}}))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.getAudioData=function(){return u(this,void 0,void 0,(function(){var t,e,n,r=this;return s(this,(function(i){return t=[],e=[],n=0,[2,new Promise((function(i){var o=setInterval((function(){r.includeSpectrogram&&(r.analyser.getFloatFrequencyData(r.freqData),r.freqData[0]===-1/0&&i({freqDataQueue:t,timeDataQueue:e}),t.push(r.freqData.slice(0,r.columnTruncateLength))),r.includeWaveform&&(r.analyser.getFloatTimeDomainData(r.timeData),e.push(r.timeData.slice())),++n===r.numFrames&&(clearInterval(o),i({freqDataQueue:t,timeDataQueue:e}))}),r.fftSize/r.sampleRateHz*1e3)}))]}))}))},n.prototype.stop=function(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())},n.prototype.toArray=function(){throw new Error("Can not convert infinite audio stream to array.")},n.prototype.getSampleRate=function(){return this.sampleRateHz},n.prototype.flattenQueue=function(t){var e=t[0].length,n=new Float32Array(t.length*e);return t.forEach((function(t,r){return n.set(t,r*e)})),n},n.prototype.getTensorFromAudioDataArray=function(t,n){var r=new Float32Array(e.util.sizeFromShape(n));return r.set(t,r.length-t.length),e.tensor(r,n)},n}(G),zt=function(t){function n(n,r){var i=t.call(this)||this;if(i.webcamVideoElement=n,i.webcamConfig=r,i.isClosed=!0,i.resize=!1,i.needToResize())if(i.resize=!0,i.cropSize=[i.webcamConfig.resizeHeight,i.webcamConfig.resizeWidth],i.cropBoxInd=e.tensor1d([0],"int32"),i.webcamConfig.centerCrop){var o=1*i.webcamConfig.resizeWidth/i.webcamVideoElement.width,u=1*i.webcamConfig.resizeHeight/i.webcamVideoElement.height,s=(1-o)/2,a=(1-u)/2,c=s+o,l=u+a;i.cropBox=e.tensor2d([a,s,l,c],[1,4])}else i.cropBox=e.tensor2d([0,0,1,1],[1,4]);return i}return o(n,t),n.prototype.summary=function(){return"webcam"},n.create=function(t,r){return void 0===r&&(r={}),u(this,void 0,void 0,(function(){var i;return s(this,(function(o){switch(o.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!r.resizeWidth||!r.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=r.resizeWidth,t.height=r.resizeHeight}return[4,(i=new n(t,r)).start()];case 1:return o.sent(),[2,i]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,n,r=this;return s(this,(function(i){switch(i.label){case 0:this.webcamConfig.facingMode&&e.util.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(function(){return"Invalid webcam facing mode: ".concat(r.webcamConfig.facingMode,". ")+"Please provide 'user' or 'environment'"})),i.label=1;case 1:return i.trys.push([1,3,,4]),t=this,[4,navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})];case 2:return t.stream=i.sent(),[3,4];case 3:throw(n=i.sent()).message="Error thrown while initializing video stream: ".concat(n.message),n;case 4:if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,[2,new Promise((function(t){r.webcamVideoElement.onloadedmetadata=function(){t()}}))]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t;return s(this,(function(n){if(this.isClosed)return[2,{value:null,done:!0}];try{t=e.browser.fromPixels(this.webcamVideoElement)}catch(t){throw new Error("Error thrown converting video to pixels: ".concat(JSON.stringify(t)))}if(!this.resize)return[2,{value:t,done:!1}];try{return[2,{value:this.cropAndResizeFrame(t),done:!1}]}catch(t){throw new Error("Error thrown cropping the video: ".concat(t.message))}finally{t.dispose()}return[2]}))}))},n.prototype.needToResize=function(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)},n.prototype.cropAndResizeFrame=function(t){var n=this;return e.tidy((function(){var r,i=e.expandDims(e.cast(t,"float32"),0),o=(r=e.image.cropAndResize(i,n.cropBox,n.cropBoxInd,n.cropSize,"bilinear")).shape;return e.reshape(r,o.slice(1))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.stop=function(){this.stream.getTracks().forEach((function(t){return t.stop()}));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0},n.prototype.toArray=function(){throw new Error("Can not convert infinite video stream to array.")},n}(G),Et=function(){},St=function(t){function e(){return null!==t&&t.apply(this,arguments)||this}return o(e,t),e.prototype.split=function(t){return new At(this,t)},e}(G),At=function(t){function e(e,n){var r=t.call(this)||this;return r.upstream=e,r.impl=new Rt(e,n),r}return o(e,t),e.prototype.summary=function(){return this.impl.summary()},e.prototype.next=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return[2,this.impl.next()]}))}))},e}(St),Rt=function(t){function e(e,n){var r=t.call(this)||this;return r.upstream=e,r.separator=n,r.carryover="",r}return o(e,t),e.prototype.summary=function(){return"".concat(this.upstream.summary()," -> Split('").concat(this.separator,"')")},e.prototype.pump=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i,o,u;return s(this,(function(s){switch(s.label){case 0:return[4,this.upstream.next()];case 1:if((t=s.sent()).done)return""===this.carryover?[2,!1]:(this.outputQueue.push(this.carryover),this.carryover="",[2,!0]);(e=t.value.split(this.separator))[0]=this.carryover+e[0];try{for(n=a(e.slice(0,-1)),r=n.next();!r.done;r=n.next())i=r.value,this.outputQueue.push(i)}catch(t){o={error:t}}finally{try{r&&!r.done&&(u=n.return)&&u.call(n)}finally{if(o)throw o.error}}return this.carryover=e[e.length-1],[2,!0]}}))}))},e}(ot),Tt=function(t){function e(){return null!==t&&t.apply(this,arguments)||this}return o(e,t),e.prototype.decodeUTF8=function(){return new kt(this)},e}(G),kt=function(t){function e(e){var n=t.call(this)||this;return n.upstream=e,n.impl=new Ft(e),n}return o(e,t),e.prototype.summary=function(){return this.impl.summary()},e.prototype.next=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return[2,this.impl.next()]}))}))},e}(St),Ft=function(t){function n(n){var r=t.call(this)||this;if(r.upstream=n,e.env().get("IS_BROWSER"))r.decoder=new TextDecoder("utf-8");else{var i=require("string_decoder").StringDecoder;r.decoder=new i("utf8")}return r}return o(n,t),n.prototype.summary=function(){return"".concat(this.upstream.summary()," -> Utf8")},n.prototype.pump=function(){return u(this,void 0,void 0,(function(){var t,n,r;return s(this,(function(i){switch(i.label){case 0:return[4,this.upstream.next()];case 1:return(t=i.sent()).done?[2,!1]:(n=t.value,r=e.env().get("IS_BROWSER")?this.decoder.decode(n,{stream:!0}):this.decoder.write(Buffer.from(n.buffer)),this.outputQueue.push(r),[2,!0])}}))}))},n}(ot),Nt=function(t){function n(n,r){void 0===r&&(r={});var i=t.call(this)||this;return i.file=n,i.options=r,e.util.assert(n instanceof Uint8Array||!!e.env().get("IS_BROWSER")&&(n instanceof File||n instanceof Blob),(function(){return"FileChunkIterator only supports File, Blob and Uint8Array right now."})),i.offset=r.offset||0,i.chunkSize=r.chunkSize||1048576,i}return o(n,t),n.prototype.summary=function(){return"FileChunks ".concat(this.file)},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t,e,n=this;return s(this,(function(r){switch(r.label){case 0:return this.offset>=(this.file instanceof Uint8Array?this.file.byteLength:this.file.size)?[2,{value:null,done:!0}]:(t=new Promise((function(t,e){var r=n.offset+n.chunkSize;if(n.file instanceof Uint8Array)t(new Uint8Array(n.file.slice(n.offset,r)));else{var i=new FileReader;i.onload=function(n){var r=i.result;if(r instanceof ArrayBuffer&&(r=new Uint8Array(r)),!(r instanceof Uint8Array))return e(new TypeError("FileReader returned unknown type."));t(r)},i.onabort=function(t){return e(new 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s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().prefetch(t)]}}))}))}),this.size)},t.prototype.repeat=function(t){var e=this,n=this;return ht((function(){return u(e,void 0,void 0,(function(){var e,r=this;return s(this,(function(i){return e=Q((function(){return u(r,void 0,void 0,(function(){var t;return s(this,(function(e){switch(e.label){case 0:return t={},[4,n.iterator()];case 1:return[2,(t.value=e.sent(),t.done=!1,t)]}}))}))})),[2,(o=e.take(t),new st(o,a))];var o,a}))}))}),null!=this.size&&t>0?this.size*t:0===t?0:null!=this.size&&(void 0===t||t<0)?1/0:null)},t.prototype.skip=function(t){var e=this,n=this;return ht((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().skip(t)]}}))}))}),null!=this.size&&t>=0&&this.size>=t?this.size-t:null!=this.size&&(this.size<t||void 0===t||t<0)?0:null)},t.prototype.shuffle=function(t,e,n){var i=this;if(void 0===n&&(n=!0),null==t||t<0)throw null==this.size?new RangeError("`Dataset.shuffle()` requires bufferSize to be specified."):new RangeError("`Dataset.shuffle()` requires bufferSize to be specified.  If your data fits in main memory (for regular JS objects), and/or GPU memory (for `tf.Tensor`s), consider setting "+"bufferSize to the dataset size (".concat(this.size," elements)"));var o=this,a=D.alea(e||r.util.now().toString());return ht((function(){return u(i,void 0,void 0,(function(){var e;return s(this,(function(r){switch(r.label){case 0:return e=a.int32(),n&&(e+=a.int32()),[4,o.iterator()];case 1:return[2,r.sent().shuffle(t,e.toString())]}}))}))}),this.size)},t.prototype.take=function(t){var e=this,n=this;return ht((function(){return u(e,void 0,void 0,(function(){return s(this,(function(e){switch(e.label){case 0:return[4,n.iterator()];case 1:return[2,e.sent().take(t)]}}))}))}),null!=this.size&&this.size>t?t:null!=this.size&&this.size<=t?this.size:null)},t.prototype.toArray=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return[4,this.iterator()];case 1:return[2,t.sent().toArray()]}}))}))},t.prototype.toArrayForTest=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:if(this.size===1/0)throw new Error("Can not convert infinite data stream to array.");return[4,this.iterator()];case 1:return[2,t.sent().toArrayForTest()]}}))}))},t}();function ht(t,e){return void 0===e&&(e=null),new(function(n){function r(){var t=n.apply(this,l([],c(arguments),!1))||this;return t.size=e,t}return o(r,n),r.prototype.iterator=function(){return u(this,void 0,void 0,(function(){return s(this,(function(e){return[2,t()]}))}))},r}(ft))}function pt(t){return null===t?null:function(t){return null==t||null===(e=t)||"object"!=typeof e&&"function"!=typeof e||Array.isArray(t)||"object"==typeof t&&t instanceof r.Tensor||r.util.isTypedArray(t);var e}(t[0])?{value:function(t){if(0===t.length)throw new Error("Can't make a batch of zero elements.");return t[0]instanceof r.Tensor?r.stack(t):r.tensor(t)}(t),recurse:!1}:{value:null,recurse:!0}}ft.MAX_BUFFER_SIZE=1e4;var dt=function(t){function e(e){var n=t.call(this)||this;return n.input=e,n}return o(e,t),e.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:return[4,this.input.iterator()];case 1:return t=n.sent(),e=t.decodeUTF8(),[2,e.split("\n").map((function(t){return t.endsWith("\r")&&(t=t.slice(0,-1)),t}))]}}))}))},e}(ft),vt='"',mt=Symbol("out"),yt=Symbol("field"),wt=Symbol("quote"),bt=Symbol("quoteafterquote"),gt=Symbol("quoteinquote"),xt=function(t){function n(n,r){var i=t.call(this)||this;return i.input=n,i.hasHeader=!0,i.fullColumnNames=null,i.columnNamesValidated=!1,i.columnConfigs=null,i.configuredColumnsOnly=!1,i.delimiter=",",i.delimWhitespace=!1,i.base=new dt(n),r||(r={}),i.hasHeader=!1!==r.hasHeader,i.fullColumnNames=r.columnNames,i.columnConfigs=r.columnConfigs,i.configuredColumnsOnly=r.configuredColumnsOnly,r.delimWhitespace?(e.util.assert(null==r.delimiter,(function(){return"Delimiter should not be provided when delimWhitespace is true."})),i.delimWhitespace=!0,i.delimiter=" "):i.delimiter=r.delimiter?r.delimiter:",",i}return o(n,t),n.prototype.columnNames=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return this.columnNamesValidated?[3,2]:[4,this.setColumnNames()];case 1:t.sent(),t.label=2;case 2:return[2,this.configuredColumnsOnly?Object.keys(this.columnConfigs):this.fullColumnNames]}}))}))},n.prototype.setColumnNames=function(){return u(this,void 0,void 0,(function(){var t,n,r,i,o,u,c,l,f=this;return s(this,(function(s){switch(s.label){case 0:return[4,this.maybeReadHeaderLine()];case 1:if(t=s.sent(),!this.fullColumnNames&&!t)throw new Error("Column names must be provided if there is no header line.");if(this.fullColumnNames&&t&&e.util.assert(t.length===this.fullColumnNames.length,(function(){return"The length of provided columnNames ("+f.fullColumnNames.length.toString()+") does not match the length of the header line read from file ("+t.length.toString()+")."})),this.fullColumnNames||(this.fullColumnNames=t),n=this.fullColumnNames.reduce((function(t,e){return t[e]=t[e]+1||1,t}),{}),r=Object.keys(n).filter((function(t){return n[t]>1})),e.util.assert(0===r.length,(function(){return"Duplicate column names found: "+r.toString()})),this.columnConfigs)try{for(i=a(Object.keys(this.columnConfigs)),o=i.next();!o.done;o=i.next())if(u=o.value,-1===this.fullColumnNames.indexOf(u))throw new Error('The key "'+u+'" provided in columnConfigs does not match any of the column names ('+this.fullColumnNames.toString()+").")}catch(t){c={error:t}}finally{try{o&&!o.done&&(l=i.return)&&l.call(i)}finally{if(c)throw c.error}}return this.columnNamesValidated=!0,[2]}}))}))},n.prototype.maybeReadHeaderLine=function(){return u(this,void 0,void 0,(function(){var t,e;return s(this,(function(n){switch(n.label){case 0:return this.hasHeader?[4,this.base.iterator()]:[3,3];case 1:return[4,n.sent().next()];case 2:if((t=n.sent()).done)throw new Error("No data was found for CSV parsing.");return e=t.value,[2,this.parseRow(e,!1)];case 3:return[2,null]}}))}))},n.prototype.iterator=function(){return u(this,void 0,void 0,(function(){var t,e=this;return s(this,(function(n){switch(n.label){case 0:return this.columnNamesValidated?[3,2]:[4,this.setColumnNames()];case 1:n.sent(),n.label=2;case 2:return[4,this.base.iterator()];case 3:return t=n.sent(),this.hasHeader&&(t=t.skip(1)),[2,t.map((function(t){return e.makeDataElement(t)}))]}}))}))},n.prototype.makeDataElement=function(t){for(var e=this.parseRow(t),n={},r={},i=0;i<this.fullColumnNames.length;i++){var o=this.fullColumnNames[i],u=this.columnConfigs?this.columnConfigs[o]:null;if(!this.configuredColumnsOnly||u){var s=e[i],a=null;if(""===s)if(u&&void 0!==u.default)a=u.default;else{if(u&&(u.required||u.isLabel))throw new Error("Required column ".concat(o," is empty in this line: ").concat(t));a=void 0}else{var c=Number(s);if(isNaN(c))a=u&&"bool"===u.dtype?this.getBoolean(s):s;else if(u&&u.dtype)switch(u.dtype){case"float32":default:a=c;break;case"int32":a=Math.floor(c);break;case"bool":a=this.getBoolean(s)}else a=c}u&&u.isLabel?r[o]=a:n[o]=a}}return 0===Object.keys(r).length?n:{xs:n,ys:r}},n.prototype.getBoolean=function(t){return"1"===t||"true"===t.toLowerCase()?1:0},n.prototype.parseRow=function(t,e){void 0===e&&(e=!0);for(var n=[],r=0,i=t.length,o=mt,u=0;u<i;u++)switch(o){case mt:switch(t.charAt(u)){case vt:r=u+1,o=wt;break;case this.delimiter:if(r=u+1," "===this.delimiter&&this.delimWhitespace)break;n.push(""),o=mt;break;default:o=yt,r=u}break;case yt:if(t.charAt(u)===this.delimiter)n.push(t.substring(r,u)),o=mt,r=u+1;break;case wt:if(t.charAt(u)===vt)o=bt;break;case bt:switch(t.charAt(u)){case this.delimiter:n.push(t.substring(r,u-1)),o=mt,r=u+1;break;case vt:o=wt;break;default:o=gt}break;case gt:if(t.charAt(u)===vt)o=wt}if(o===bt?n.push(t.substring(r,i-1)):n.push(t.substring(r)),e&&n.length!==this.fullColumnNames.length)throw new Error("Invalid row in csv file. Should have ".concat(this.fullColumnNames.length," elements in a row, but got ").concat(n));return n},n}(ft),Ct=function(t){function n(e){var n=t.call(this)||this;n.microphoneConfig=e,n.isClosed=!1,n.fftSize=e.fftSize||1024;var r=Math.log2(n.fftSize);if(n.fftSize<0||r<4||r>14||!Number.isInteger(r))throw new Error("Invalid fftSize: it must be a power of 2 between "+"2 to 4 and 2 to 14, but got ".concat(n.fftSize));if(n.numFrames=e.numFramesPerSpectrogram||43,n.sampleRateHz=e.sampleRateHz,n.columnTruncateLength=e.columnTruncateLength||n.fftSize,n.audioTrackConstraints=e.audioTrackConstraints,n.smoothingTimeConstant=e.smoothingTimeConstant||0,n.includeSpectrogram=!1!==e.includeSpectrogram,n.includeWaveform=!0===e.includeWaveform,!n.includeSpectrogram&&!n.includeWaveform)throw new Error("Both includeSpectrogram and includeWaveform are false. At least one type of data should be returned.");return n}return o(n,t),n.prototype.summary=function(){return"microphone"},n.create=function(t){return void 0===t&&(t={}),u(this,void 0,void 0,(function(){var r;return s(this,(function(i){switch(i.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("microphone API is only supported in browser environment.");return[4,(r=new n(t)).start()];case 1:return i.sent(),[2,r]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,e,n,r;return s(this,(function(i){switch(i.label){case 0:return i.trys.push([0,2,,3]),t=this,[4,navigator.mediaDevices.getUserMedia({audio:null==this.audioTrackConstraints||this.audioTrackConstraints,video:!1})];case 1:return t.stream=i.sent(),[3,3];case 2:throw e=i.sent(),new Error("Error thrown while initializing video stream: ".concat(e.message));case 3:if(!this.stream)throw new Error("Could not obtain audio from microphone.");if(n=window.AudioContext||window.webkitAudioContext,this.audioContext=new n,this.sampleRateHz){if(this.audioContext.sampleRate!==this.sampleRateHz)throw new Error("Mismatch in sampling rate: "+"Expected: ".concat(this.sampleRateHz,"; ")+"Actual: ".concat(this.audioContext.sampleRate))}else this.sampleRateHz=this.audioContext.sampleRate;return r=this.audioContext.createMediaStreamSource(this.stream),this.analyser=this.audioContext.createAnalyser(),this.analyser.fftSize=2*this.fftSize,this.analyser.smoothingTimeConstant=this.smoothingTimeConstant,r.connect(this.analyser),this.freqData=new Float32Array(this.fftSize),this.timeData=new Float32Array(this.fftSize),[2]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i;return s(this,(function(o){switch(o.label){case 0:return this.isClosed?[2,{value:null,done:!0}]:[4,this.getAudioData()];case 1:return n=o.sent(),this.includeSpectrogram&&(r=this.flattenQueue(n.freqDataQueue),t=this.getTensorFromAudioDataArray(r,[this.numFrames,this.columnTruncateLength,1])),this.includeWaveform&&(i=this.flattenQueue(n.timeDataQueue),e=this.getTensorFromAudioDataArray(i,[this.numFrames*this.fftSize,1])),[2,{value:{spectrogram:t,waveform:e},done:!1}]}}))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.getAudioData=function(){return u(this,void 0,void 0,(function(){var t,e,n,r=this;return s(this,(function(i){return t=[],e=[],n=0,[2,new Promise((function(i){var o=setInterval((function(){r.includeSpectrogram&&(r.analyser.getFloatFrequencyData(r.freqData),r.freqData[0]===-1/0&&i({freqDataQueue:t,timeDataQueue:e}),t.push(r.freqData.slice(0,r.columnTruncateLength))),r.includeWaveform&&(r.analyser.getFloatTimeDomainData(r.timeData),e.push(r.timeData.slice())),++n===r.numFrames&&(clearInterval(o),i({freqDataQueue:t,timeDataQueue:e}))}),r.fftSize/r.sampleRateHz*1e3)}))]}))}))},n.prototype.stop=function(){this.isClosed||(this.isClosed=!0,this.analyser.disconnect(),this.audioContext.close(),null!=this.stream&&this.stream.getTracks().length>0&&this.stream.getTracks()[0].stop())},n.prototype.toArray=function(){throw new Error("Can not convert infinite audio stream to array.")},n.prototype.getSampleRate=function(){return this.sampleRateHz},n.prototype.flattenQueue=function(t){var e=t[0].length,n=new Float32Array(t.length*e);return t.forEach((function(t,r){return n.set(t,r*e)})),n},n.prototype.getTensorFromAudioDataArray=function(t,n){var r=new Float32Array(e.util.sizeFromShape(n));return r.set(t,r.length-t.length),e.tensor(r,n)},n}(G),zt=function(t){function n(n,r){var i=t.call(this)||this;if(i.webcamVideoElement=n,i.webcamConfig=r,i.isClosed=!0,i.resize=!1,i.needToResize())if(i.resize=!0,i.cropSize=[i.webcamConfig.resizeHeight,i.webcamConfig.resizeWidth],i.cropBoxInd=e.tensor1d([0],"int32"),i.webcamConfig.centerCrop){var o=1*i.webcamConfig.resizeWidth/i.webcamVideoElement.width,u=1*i.webcamConfig.resizeHeight/i.webcamVideoElement.height,s=(1-o)/2,a=(1-u)/2,c=s+o,l=u+a;i.cropBox=e.tensor2d([a,s,l,c],[1,4])}else i.cropBox=e.tensor2d([0,0,1,1],[1,4]);return i}return o(n,t),n.prototype.summary=function(){return"webcam"},n.create=function(t,r){return void 0===r&&(r={}),u(this,void 0,void 0,(function(){var i;return s(this,(function(o){switch(o.label){case 0:if(!e.env().get("IS_BROWSER"))throw new Error("tf.data.webcam is only supported in browser environment.");if(!t){if(t=document.createElement("video"),!r.resizeWidth||!r.resizeHeight)throw new Error("Please provide webcam video element, or resizeWidth and resizeHeight to create a hidden video element.");t.width=r.resizeWidth,t.height=r.resizeHeight}return[4,(i=new n(t,r)).start()];case 1:return o.sent(),[2,i]}}))}))},n.prototype.start=function(){return u(this,void 0,void 0,(function(){var t,n,r=this;return s(this,(function(i){switch(i.label){case 0:this.webcamConfig.facingMode&&e.util.assert("user"===this.webcamConfig.facingMode||"environment"===this.webcamConfig.facingMode,(function(){return"Invalid webcam facing mode: ".concat(r.webcamConfig.facingMode,". ")+"Please provide 'user' or 'environment'"})),i.label=1;case 1:return i.trys.push([1,3,,4]),t=this,[4,navigator.mediaDevices.getUserMedia({video:{deviceId:this.webcamConfig.deviceId,facingMode:this.webcamConfig.facingMode?this.webcamConfig.facingMode:"user",width:this.webcamVideoElement.width,height:this.webcamVideoElement.height}})];case 2:return t.stream=i.sent(),[3,4];case 3:throw(n=i.sent()).message="Error thrown while initializing video stream: ".concat(n.message),n;case 4:if(!this.stream)throw new Error("Could not obtain video from webcam.");try{this.webcamVideoElement.srcObject=this.stream}catch(t){console.log(t),this.webcamVideoElement.src=window.URL.createObjectURL(this.stream)}return this.webcamVideoElement.play(),this.isClosed=!1,[2,new Promise((function(t){r.webcamVideoElement.onloadedmetadata=function(){t()}}))]}}))}))},n.prototype.next=function(){return u(this,void 0,void 0,(function(){var t;return s(this,(function(n){if(this.isClosed)return[2,{value:null,done:!0}];try{t=e.browser.fromPixels(this.webcamVideoElement)}catch(t){throw new Error("Error thrown converting video to pixels: ".concat(JSON.stringify(t)))}if(!this.resize)return[2,{value:t,done:!1}];try{return[2,{value:this.cropAndResizeFrame(t),done:!1}]}catch(t){throw new Error("Error thrown cropping the video: ".concat(t.message))}finally{t.dispose()}return[2]}))}))},n.prototype.needToResize=function(){return!(!this.webcamConfig.resizeWidth||!this.webcamConfig.resizeHeight||this.webcamVideoElement.width===this.webcamConfig.resizeWidth&&this.webcamVideoElement.height===this.webcamConfig.resizeHeight)},n.prototype.cropAndResizeFrame=function(t){var n=this;return e.tidy((function(){var r,i=e.expandDims(e.cast(t,"float32"),0),o=(r=e.image.cropAndResize(i,n.cropBox,n.cropBoxInd,n.cropSize,"bilinear")).shape;return e.reshape(r,o.slice(1))}))},n.prototype.capture=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){switch(t.label){case 0:return[4,this.next()];case 1:return[2,t.sent().value]}}))}))},n.prototype.stop=function(){this.stream.getTracks().forEach((function(t){return t.stop()}));try{this.webcamVideoElement.srcObject=null}catch(t){console.log(t),this.webcamVideoElement.src=null}this.isClosed=!0},n.prototype.toArray=function(){throw new Error("Can not convert infinite video stream to array.")},n}(G),Et=function(){},St=function(t){function e(){return null!==t&&t.apply(this,arguments)||this}return o(e,t),e.prototype.split=function(t){return new At(this,t)},e}(G),At=function(t){function e(e,n){var r=t.call(this)||this;return r.upstream=e,r.impl=new Rt(e,n),r}return o(e,t),e.prototype.summary=function(){return this.impl.summary()},e.prototype.next=function(){return u(this,void 0,void 0,(function(){return s(this,(function(t){return[2,this.impl.next()]}))}))},e}(St),Rt=function(t){function e(e,n){var r=t.call(this)||this;return r.upstream=e,r.separator=n,r.carryover="",r}return o(e,t),e.prototype.summary=function(){return"".concat(this.upstream.summary()," -> Split('").concat(this.separator,"')")},e.prototype.pump=function(){return u(this,void 0,void 0,(function(){var t,e,n,r,i,o,u;return s(this,(function(s){switch(s.label){case 0:return[4,this.upstream.next()];case 1:if((t=s.sent()).done)return""===this.carryover?[2,!1]:(this.outputQueue.push(this.carryover),this.carryover="",[2,!0]);(e=t.value.split(this.separator))[0]=this.carryover+e[0];try{for(n=a(e.slice(0,-1)),r=n.next();!r.done;r=n.next())i=r.value,this.outputQueue.push(i)}catch(t){o={error:t}}finally{try{r&&!r.done&&(u=n.return)&&u.call(n)}finally{if(o)throw o.error}}return this.carryover=e[e.length-1],[2,!0]}}))}))},e}(ot),Tt=function(t){function e(){return null!==t&&t.apply(this,arguments)||this}return o(e,t),e.prototype.decodeUTF8=function(){return new kt(this)},e}(G),kt=function(t){function e(e){var n=t.call(this)||this;return 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dist/version.d.ts

 /** @license See the LICENSE file. */
 /// <amd-module name="@tensorflow/tfjs-data/dist/version" />
-declare const version = "4.5.0";
+declare const version = "4.6.0";
 export { version };

dist/version.js

 /** @license See the LICENSE file. */
 // This code is auto-generated, do not modify this file!
-const version = '4.5.0';
+const version = '4.6.0';
 export { version };
-//# sourceMappingURL=data:application/json;base64,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
+//# sourceMappingURL=data:application/json;base64,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

package.json

 {
   "name": "@tensorflow/tfjs-data",
-  "version": "4.5.0",
+  "version": "4.6.0",
   "description": "TensorFlow Data API in JavaScript",
@@ -35,3 +35,3 @@ "private": false,
   "peerDependencies": {
-    "@tensorflow/tfjs-core": "4.5.0",
+    "@tensorflow/tfjs-core": "4.6.0",
     "seedrandom": "^3.0.5"
@@ -38,0 +38,0 @@ },

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